Engine Control System & Fuel - 4.8l, 5.3l, 6.0l or 6.2l - Introduction Chevrolet Avalanche II

Temperature Versus Resistance

Altitude Versus Barometric Pressure

Ignition System Specifications

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Diagnostic Starting Point - Engine Controls

Begin the system diagnosis with Diagnostic System Check - Vehicle (with HP2) or Diagnostic System Check - Vehicle (without HP2) . The Diagnostic System Check - Vehicle will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and the codes' statuses

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Engine Control Module Replacement

Removal Procedure

1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
3. Disengage the engine wiring harness upper electrical connector retainer (2) and remove the connector (1) from the ECM.
4. Disengage the engine wiring harness lower electrical connector retainer (3) and remove the connector (4) from the ECM.
5. Disengage the retainer tabs securing the ECM to the bracket.
6. Remove the ECM.

Installation Procedure

1. Install the bottom ECM tabs into the bracket.
2. Push the ECM in securing the ECM to the bracket.
3. Position the engine wiring harness lower electrical connector and engage the retainer (3) securing the lower connector (4) to the ECM.
4. Position the engine wiring harness upper electrical connector and engage the retainer (2) securing the upper connector (1) to the ECM.
5. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
6. If a NEW ECM was installed, program the ECM. Refer to «Control Module References»(/chevrolet/avalanche/ii-2006-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .

Crankshaft Position System Variation Learn

1. Install a scan tool.
2. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) for the applicable DTC that set.
3. Select the crankshaft position (CKP) variation learn procedure with a scan tool.
4. The scan tool instructs you to perform the following: Accelerate to wide open throttle (WOT). Release throttle when fuel cut-off occurs. Observe fuel cut-off for applicable engine. Engine should not accelerate beyond calibrated RPM value. Release throttle immediately if value is exceeded. Block drive wheels. Set parking brake. DO NOT apply brake pedal. Cycle ignition from OFF to ON. Apply and hold brake pedal. Start and idle engine. Turn A/C OFF. Vehicle must remain in Park or Neutral. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
5. Enable the CKP System Variation Learn Procedure with a scan tool.
6. Accelerate to WOT.
7. Release when the fuel cut-off occurs.
8. Test in progress.
9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP Variation Learn Procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to «DTC P0315»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-dtc-p0230-to-dtc-p0690) . If any other DTCs set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) for the applicable DTC that set.
10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
11. The CKP Variation Learn Procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: A CKP sensor replacement An engine replacement A ECM replacement A harmonic balancer replacement A crankshaft replacement Any engine repairs which disturb the CKP sensor relationship

Description

The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to throttle body coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.

An engine that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.

The idle may be unstable or a DTC may set if the learned values do not match the actual airflow.

Conditions for Running the Throttle Learn Procedure

Reset Procedure

1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.
2. Ignition ON, engine OFF.
3. The vehicle speed sensor (VSS) is 0 km/h (0 mph).

Learn Procedure

1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.
2. The engine speed is between 450-4,000 RPM.
3. The manifold absolute pressure (MAP) is greater than 5 kPa.
4. The mass air flow (MAF) is greater than 2 g/s.
5. The ignition voltage is greater than 10 volts.

Throttle Learn

Reset Procedure (Performed after the throttle body is cleaned or replaced)

1. Ignition ON, engine OFF, perform the Idle Learn Reset in Module Setup with a scan tool.
2. Start the engine and monitor the TB Idle Airflow Compensation parameter. The TB Idle Airflow Compensation value should equal 0 percent and the engine should be idling at a normal idle speed.
3. Clear the DTCs and return to the diagnostic that referred you here.

Learn Procedure (Performed after the ECM is flashed or replaced)

1. Start and idle the engine for 3 minutes.
2. With a scan tool, monitor the Desired Idle Speed and the actual Engine Speed.
3. The ECM will start to learn the new idle cells and Desired Idle Speed should start to decrease.
4. Ignition OFF for 60 seconds.
5. Start and idle the engine for 3 minutes.
6. After the 3 minute run time the engine should be idling normal. NOTE: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn. If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
7. After the drive cycle, the engine should be idling normally. If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs and return to the diagnostic that referred you here.

1. Drain the cooling system to a level below the engine cooling temperature (ECT) sensor. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/avalanche/ii-2006-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Disconnect the engine wiring harness electrical connector (2) from the ECT sensor.
3. Remove the ECT sensor.

1. If installing the old sensor, coat the threads with sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent.
2. Install the ECT sensor and tighten to 20 N.m (15 lb ft).
3. Connect the engine wiring harness electrical connector (2) to the ECT sensor.
4. Refill the cooling. Refer to «Cooling System Draining and Filling (Static Fill)»(/chevrolet/avalanche/ii-2006-2013/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 16

1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .
2. Disconnect the engine wiring harness electrical connector (4) from the manifold absolute pressure (MAP) sensor.
3. Remove the MAP sensor retainer.
4. Remove the MAP sensor.

1. Install the MAP sensor.
2. Install the MAP sensor retainer.
3. Connect the engine harness wiring electrical connector (4) to the MAP sensor.
4. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

1. Disconnect the chassis wiring harness electrical connector (1) from the brake booster vacuum sensor.
2. Remove the brake booster vacuum sensor from the brake booster.
3. Remove the brake booster vacuum sensor grommet from the brake booster.

1. Install the brake booster vacuum sensor grommet to the brake booster.
2. Install the brake booster vacuum sensor to the brake booster.
3. Connect the chassis wiring harness electrical connector (1) to the brake booster vacuum sensor.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Unbolt the front propeller shaft from the front differential, if equipped with four wheel drive (4WD). Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
3. For vehicles equipped with a 4L60-E/4L70-E automatic transmission perform the following steps, for vehicles equipped with a 6L80-E automatic transmission proceed to step 7.
4. Remove the connector position assurance (CPA) retainer.
5. Disconnect the engine wiring harness electrical connector (2) from the HO2S.
6. Remove the HO2S electrical connector clip (1) from the fuel line clip.
7. Remove the CPA retainer (2).
8. Remove the engine wiring harness electrical connector clip (1) from the fuel line clip.
9. Disconnect the engine wiring harness electrical connector (3) from the HO2S.
10. Remove the HO2S (1 or 2).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (1 or 2) and tighten to 42 N.m (31 lb ft).
3. For vehicles equipped with a 4L60-E/4L70-E automatic transmission perform the following steps, for vehicles equipped with a 6L80-E automatic transmission proceed to step 7.
4. Install the HO2S electrical connector clip (1) to the fuel line clip.
5. Connect the engine wiring harness electrical connector (2) to the HO2S.
6. Install the CPA retainer.
7. Connect the engine wiring harness electrical connector (3) to the HO2S.
8. Install the engine wiring harness electrical connector clip (1) to the fuel line clip.
9. Install the CPA retainer (2).
10. Install the front propeller shaft to the front differential, if equipped with 4WD. Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
11. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Unbolt the front propeller shaft from the front differential, if equipped with four wheel drive (4WD). Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
3. Remove the connector position assurance (CPA) retainer (2).
4. Disconnect the HO2S electrical connector from the engine wiring harness electrical connector (3).
5. Remove the HO2S (1).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (1) and tighten to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector to the engine wiring harness electrical connector (3).
4. Install the CPA retainer (2).
5. Install the front propeller shaft to the front differential, if equipped with 4WD. Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
6. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Remove the connector position assurance (CPA) retainer (1).
3. Disconnect the HO2S electrical connector from the engine wiring harness electrical connector (3).
4. Remove the HO2S (4).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (4) and tighten to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector to the engine wiring harness electrical connector (3).
4. Install the CPA retainer (1).
5. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Remove the connector position assurance (CPA) retainer (1).
3. Disconnect the HO2S electrical connector from the engine wiring harness electrical connector (3).
4. Remove the HO2S (5).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (5) and tighten to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector to the engine wiring harness electrical connector (3).
4. Install the CPA retainer (1).
5. Lower the vehicle.

1. Remove the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
2. Remove the connector position assurance (CPA) retainer (2).
3. Disconnect the HO2S electrical connector (7) from the engine wiring harness electrical connector (1).
4. Remove the HO2S clip (8) from the engine wiring harness.
5. Remove the HO2S (3).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (3) and tighten to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector (7) to the engine wiring harness electrical connector (1).
4. Install the CPA retainer (2).
5. Install the HO2S clip (8) to the engine wiring harness.
6. Install the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .

1. Remove the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
2. Remove the connector position assurance (CPA) retainer (5).
3. Disconnect the HO2S electrical connector from the engine wiring harness electrical connector (1).
4. Remove the HO2S (2).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (2) and tighten to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector to the engine wiring harness electrical connector (1).
4. Install the CPA retainer (5).
5. Install the right wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Remove the connector position assurance (CPA) retainer (3).
3. Disconnect the engine wiring harness electrical connector (2) from the HO2S electrical connector.
4. Remove the HO2S electrical connector clip from the engine harness clip (4).
5. Remove the HO2S (3).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (3) and tighten to 42 N.m (31 lb ft).
3. Install the HO2S electrical connector clip to the engine harness clip (4).
4. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector.
5. Install the CPA retainer (3).
6. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Remove the connector position assurance (CPA) retainer (4).
3. Disconnect the engine wiring harness electrical connector (4) from the HO2S electrical connector (3).
4. Remove the HO2S electrical connector clip from the engine harness clip (6).
5. Remove the HO2S (4).

Note. A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
2. Install the HO2S (4) and tighten to 42 N.m (31 lb ft).
3. Install the HO2S electrical connector clip to the engine harness clip (6).
4. Connect the engine wiring harness electrical connector (4) to the HO2S electrical connector (3).
5. Install the CPA retainer (5).
6. Lower the vehicle.

1. Remove the knee bolster. Refer to «Knee Bolster Replacement (Except Cadillac)»(/chevrolet/avalanche/ii-2006-2013/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Knee Bolster Replacement (Cadillac)»(/chevrolet/avalanche/ii-2006-2013/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
2. Push down the small tab and disconnect the accelerator pedal position (APP) sensor electrical connector (1).
3. Remove the accelerator pedal bolts.
4. Remove the accelerator pedal.

1. Position the accelerator pedal to the accelerator pedal bracket.
2. Install the accelerator pedal bolts and tighten to 9 N.m (80 lb in).
3. Connect the APP sensor electrical connector (1).
4. Connect a scan tool to the diagnostic port in order to test for proper throttle-opening and throttle-closing range.
5. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
6. Verify that the vehicle meets the following conditions: The vehicle is not in a reduced engine power mode. The ignition is ON. The engine is OFF.
7. Install the knee bolster. Refer to «Knee Bolster Replacement (Except Cadillac)»(/chevrolet/avalanche/ii-2006-2013/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Knee Bolster Replacement (Cadillac)»(/chevrolet/avalanche/ii-2006-2013/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the engine wiring harness electrical connector (3) from the electronic throttle control.
3. Remove the throttle body nuts (507) and bolts (538).
4. Remove the throttle body (508).
5. Remove and discard the throttle body gasket (509).

1. Install a NEW throttle body gasket to the intake manifold. Align the tab of the gasket with the notch in the manifold.
2. Install the throttle body (508), bolts (538), and nuts (507) and tighten to 10 N.m (89 lb in).
3. Connect the engine wiring harness electrical connector (3) to the electronic throttle control.
4. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Connect a scan tool in order to test for proper throttle-opening and throttle-closing range.
6. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
7. Verify that the vehicle meets the following conditions: The vehicle is not in a reduced engine power mode. The ignition is ON. The engine is OFF.
8. Perform the Throttle Learn Procedure. Refer to «Throttle Learn»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__throttle-learn) .
9. Inspect for coolant leaks.

Throttle Body Cleaning

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) . WARNING: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury. CAUTION: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.
2. Inspect the throttle body bore and the throttle plate for deposits. You will need to open the throttle plate in order to inspect all surfaces. CAUTION: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.
3. Clean the throttle body bore and the throttle plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626, or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
4. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Perform the Throttle Learn Procedure. Refer to «Throttle Learn»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__throttle-learn) .

Special Tools

CH-48027 Digital Pressure Gage. See Special Tools .

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Connect the CH-48027-1 (1) to the CH-48027-2 (2).
3. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
4. Perform any tests and/or diagnostics as needed. For the proper usage of the CH-48027 , refer to the manufacture's directions. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Relieve the fuel system pressure, if required. Perform the following steps: WARNING: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete. Wrap a shop towel around the fuel rail service port. Place the hose on the CH-48027-2 (2) into an approved gasoline container. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail. Close the valve on the CH-48027-2 (2). Remove the hose on the CH-48027-2 (2) from the approved gasoline container. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
2. Disconnect the CH-48027-1 (1) from the CH-48027-2 (2).
3. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
4. Disconnect the CH-48027-3 (4) from the fuel rail service port.
5. Install the fuel rail service port cap.
6. Tighten the fuel fill cap.

CH-48027: Digital Pressure Gage

1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(/chevrolet/avalanche/ii-2006-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-ground-electrical-center-identification-views) .
2. Remove the engine cover, if required.
3. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
4. Remove the fuel rail service port cap.
5. Wrap a shop towel around the fuel rail service port.
6. Connect the CH-48027-3 (4) to the fuel rail service port.
7. Connect the CH-48027-2 (2) to the CH-48027-3 (4).
8. Place the hose on the CH-48027-2 (2) into an approved gasoline container.
9. Open the valve on the CH-48027-2 (2) in order to bleed any fuel from the fuel rail.
10. Close the valve on the CH-48027-2 (2).
11. Remove the hose on the CH-48027-2 (2) from the approved gasoline container.
12. Disconnect the CH-48027-2 (2) from the CH-48027-3 (4).
13. Disconnect the CH-48027-3 (4) from the fuel rail service port.
14. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
15. Install the fuel rail service port cap.
16. Install the engine cover, if required.
17. Tighten the fuel fill cap.

Fuel Pressure Relief (Without CH-48027)

1. If the fuel system requires repair, prevent fuel spillage by removing the fuel pump fuse. Refer to «Electrical Center Identification Views»(/chevrolet/avalanche/ii-2006-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-ground-electrical-center-identification-views) .
2. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
3. Remove the engine cover, if required.
4. Remove the fuel rail service port cap.
5. Wrap a shop towel around the fuel rail service port and using a small flat-bladed tool, depress (open) the fuel rail test port valve.
6. Remove the shop towel from around the fuel rail service port, and place in an approved gasoline container.
7. Install the fuel rail service port cap.
8. Install the engine cover, if required.
9. Tighten the fuel fill cap.

J 41769 Fuel Line Quick Disconnect Tool. See Special Tools .

Disconnect Procedure

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Remove the fuel line retainer.
3. Using compressed air, blow any dirt or debris from around the connection.
4. Using the correct tool from the J 41769 , insert the tool into the female connector end, then push inward in order to release the quick connect locking tabs. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Pull the fuel line connection apart.
6. Use a clean shop towel in order to wipe off the male connection end.
7. Inspect both ends of the fitting for dirt and burrs. Clean or replace the components as required.

Connect Procedure

1. Apply a few drops of clean engine oil to the male connection end.
2. Push both sides of the fitting together in order to engage the retaining tabs.
3. Once installed, pull on both sides of the connection in order to ensure the connection is secure.
4. Install the fuel line retainer.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Using compressed air, blow any dirt or debris from around the connection.
3. This step applies to Bartholomew style connector ONLY. Squeeze the plastic quick connect fitting release tabs.
4. This step applies to release tab style connector ONLY. Release the fitting by pushing the tab toward the other side of the slot in the fitting.
5. This step applies to the squeeze-to-release style connector ONLY. Squeeze where indicated by the arrows shown above on both sides of the plastic ring surrounding the quick connect fitting.
6. This step applies to the sliding retainer style connector ONLY. Release the fitting by pressing on one side of the release tab causing it to push in slightly. If the tab does not move try pressing the tab in from the opposite side. The tab will only move in one direction.
7. This step applies to the Push Down TI style connector ONLY. Release the fitting by pressing on the tab indicated by the arrow.
8. Pull the connection apart.

1. Apply a few drops of clean engine oil to the male connection end.
2. Push both sides of the quick-connect fitting together in order to cause the retaining feature to snap into place.
3. Once installed, pull on both sides of the connection in order to make sure the connection is secure.

1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disengage the fuel pump flow control module cover retainers (2) from the frame.
3. Remove the fuel pump flow control module cover (1).
4. Disconnect the chassis wiring harness electrical connector (1) from the fuel pump flow control module.
5. Loosen the fuel pump flow control module bolts (1).
6. Slide the fuel pump flow control module (2) towards the passenger side of the vehicle.
7. Remove the fuel pump flow control module from the vehicle.

1. Position the fuel pump flow control module (2) to the vehicle.
2. Slide the fuel pump flow control module towards the driver side of the vehicle.
3. Tighten the fuel pump flow control module bolts (1). Tighten: Tighten the bolts to 9 N.m (80 lb in).
4. Connect the chassis wiring harness electrical connector (1) to the fuel pump flow control module.
5. Position the fuel pump flow control module cover (1) over the module.
6. Install the fuel pump flow control module cover retainers (2) to the frame.
7. Lower the vehicle.
8. Program the fuel pump flow control module. Refer to «Control Module References»(/chevrolet/avalanche/ii-2006-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .

J 45004 Fuel Tank Siphon Hose. See Special Tools .

Draining

1. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
3. Loosen the fuel fill hose clamp (1) at the front tank.
4. Remove the fuel fill hose from the front tank.
5. Insert the siphon hose from the J 45004 into the fuel tank. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Attach the siphon hose from the J 45004 to the pump devise hose. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Using a hand or air operated pump device, drain as much fuel from the tank as possible.

Fuel Tank Draining (Single Tank)

1. Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
3. Loosen the fuel fill hose clamp (6).
4. Remove the fuel fill hose from the fuel tank.
5. Insert the hose from the pump devise into the fuel tank.
6. Using a hand or air operated pump device, drain as much fuel from the tank as possible.

J 45004 Fuel Tank Siphon Hose. See Special Tools .

1. Remove the fuel fill cap.
2. Remove the fuel tank filler housing to body TORX® screws (1) and retainer (2).
3. Remove the fuel tank filler housing to fuel tank fill pipe screws.
4. Remove the filler housing.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
6. Loosen the fill hose clamp (3) at the rear tank.
7. Remove the fill hose from the rear tank.
8. Insert the siphon hose from the J 45004 into the fuel tank. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Attach the siphon hose from the J 45004 to the pump devise. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Using a hand or air operated pump device, drain as much fuel from the tank as possible.

1. Remove the rear fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the chassis wiring harness ground bolt (2).
3. Remove the left rear lamp ground wire (4) and fill pipe ground strap (5) from the frame.
4. Remove the rear axle vent hose clip from the fill pipe neck.
5. Loosen the fuel tank fill hose clamp (1) at the front tank.
6. Disconnect the fuel fill hose evaporative emission (EVAP) line quick connect fitting (2) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Remove the fuel fill hose from the front tank.
8. Remove the fuel fill hose integral clamp from the crossmember.
9. Remove the fuel fill hose/pipe assembly.
10. Cap the open end of the fuel tank in order to prevent fuel system contamination.
11. Cap the open ends of the fuel/EVAP lines in order to prevent fuel/EVAP system contamination.
12. If replacing any serviceable part of the fill pipe assembly proceed to the disassemble procedure, otherwise proceed to the installation procedure.

Disassemble

1. Evaporative emission canister hose (1)
2. Evaporative emission canister hose clamp (2)
3. Fuel tank fill pipe clamp (3)
4. Fuel tank fill pipe housing bolts (4)
5. Fuel tank fill pipe housing (5)
6. Fuel tank fill pipe restrictor (6)
7. Fuel tank fill pipe clamp (7)
8. Fuel tank vent hose (8)
9. Fuel tank fill hose clamp (9)
10. Evaporative emission canister hose clip (10)
11. Fuel tank fill pipe (11)
12. Fuel tank fill hose clamp (12)

Assemble

1. Fuel tank fill hose clamp (12) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
2. Fuel tank fill pipe (11)
3. Evaporative emission canister hose clip (10)
4. Fuel tank fill hose clamp (9) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
5. Fuel tank vent hose (8)
6. Fuel tank fill pipe clamp (7) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
7. Fuel tank fill pipe restrictor (6)
8. Fuel tank fill pipe housing (5)
9. Fuel tank fill pipe housing bolts (4) Tighten: Tighten the bolts to 2.3 N.m (20 lb in).
10. Fuel tank fill pipe clamp (3) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
11. Evaporative emission canister hose clamp (2) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
12. Evaporative emission canister hose (1)

1. Remove the caps from the open end of the front fuel tank.
2. Remove the caps from the fuel/EVAP lines.
3. Install the fuel fill hose/pipe assembly.
4. Install the fuel fill hose to the front tank.
5. Connect the fuel fill hose EVAP line quick connect fitting (2) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Tighten the fuel tank fill hose clamp (1) at the front tank. Tighten: Tighten the clamps to 2.5 N.m (22 lb in).
7. Install the fuel fill hose integral clamp to the crossmember.
8. Install the rear axle vent hose clip to the fill pipe neck.
9. Position the fill pipe ground strap (5) to the left rear lamp ground wire (4).
10. Install the rear lamp ground wire (4) and ground strap (5) to the frame. Insert the lamp ground wire anti-rotation tab into the hole in the frame.
11. Insert the chassis wiring harness ground bolt. Tighten: Tighten the bolt to 9 N.m (80 lb in).
12. Install the rear fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

Note. Clean the fuel connections and surrounding areas prior to disconnecting the lines in order to avoid possible contamination.

1. Remove the fuel fill cap.
2. Remove the fuel tank filler housing to body TORX® screws (1) and retainer (2).
3. Remove the spare tire stowage lock cylinder, if necessary.
4. Remove the spare tire, if necessary.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
6. Remove the rear axle vent hose clip (1) from the fill pipe.
7. If necessary, remove the air suspension hose at the fill pipe.
8. Remove the chassis wiring harness ground bolt (2).
9. Remove the left rear lamp ground wire (4) and fill pipe ground strap (5) from the frame.
10. Disconnect the fuel tank vent line quick connect fitting (5) from the fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Disconnect the fuel fill hose vent line quick connect fitting (3) from the EVAP canister vent solenoid valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
12. Loosen the fuel fill hose clamp (6).
13. Remove the fuel fill pipe bracket bolts (2, 4).
14. Remove the fuel fill hose from the fuel tank.
15. Cap the fuel tank opening and EVAP vent line in order to prevent fuel/EVAP system contamination.
16. If replacing any serviceable part of the fill pipe assembly proceed to the disassemble procedure, otherwise proceed to the installation procedure.

Disassemble Procedure

1. Fuel tank filler vent hose (1)
2. Fuel tank fill pipe housing bolts (2)
3. Fuel tank fill pipe housing (3)
4. Fuel tank fill hose (4)
5. Fuel tank fill pipe clip (5)
6. Fuel tank fill hose clamp (6)
7. Fuel tank fill hose (7)
8. Fuel tank fill hose clamp (8)
9. Evaporative emission hose (9)
10. Evaporative emission hose clamp (10)

Assemble Procedure

1. Evaporative emission hose clamp (10) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
2. Evaporative emission hose (9)
3. Fuel tank fill hose clamp (8) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
4. Fuel tank fill hose (7)
5. Fuel tank fill hose clamp (6) Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
6. Fuel tank fill pipe clip (5)
7. Fuel tank fill hose (4)
8. Fuel tank fill pipe housing (3)
9. Fuel tank fill pipe housing bolts (2) Tighten: Tighten the bolts to 2.3 N.m (20 lb in).
10. Fuel tank filler vent hose (1)

1. Remove the caps from the fuel tank opening and the EVAP vent line.
2. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
3. Tighten the fuel fill hose clamp (6). Tighten: Tighten the clamps to 2.5 N.m (22 lb in).
4. Install the fuel fill pipe bracket bolts (2, 4). Tighten: Tighten the bolt to 12 N.m (106 lb in).
5. Connect the fuel fill hose vent line quick connect fitting (3) to the EVAP canister vent solenoid valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Connect the fuel fill pipe vent line to the fuel tank quick connect fitting (5). Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Position the fill pipe ground strap (5) to the left rear lamp ground wire (4).
8. Install the rear lamp ground wire (4) and ground strap (5) to the frame. Insert the lamp ground wire anti-rotation tab into the hole in the frame.
9. Install the chassis wiring harness ground bolt. Tighten: Tighten the bolt to 9 N.m (80 lb in).
10. If necessary, install the air suspension hose at the fill pipe.
11. Install the rear axle vent hose clip (1) to the fill pipe.
12. Lower the vehicle.
13. Install the fuel tank filler housing to body TORX® screws (1) and retainer (2). Tighten: Tighten the screws to 2.3 N.m (20 lb in).
14. Install the spare tire, if necessary.
15. Install the spare tire stowage lock cylinder, if necessary.
16. Install the fuel fill cap.

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

Note. Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Drain the fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fuel tank vent line quick connect fitting (5) from the fuel fill pipe vent line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
7. Disconnect the fuel tank EVAP lines (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Cap the EVAP lines in order to prevent possible EVAP system contamination.
9. Disconnect the fuel tank EVAP line quick connect fitting (1) at the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Using an adjustable jack, support the fuel tank.
11. Remove the fuel tank strap bolts.
12. Remove the fuel tank straps.
13. With the aid of an assistant, carefully lower the rear of the fuel tank.
14. Slide the front of the tank away from the frame.
15. Lower the fuel tank slightly until the chassis wiring harness electrical connectors can be accessed.
16. Disengage the chassis wiring harness electrical connector, connector position assurance (CPA) retainer at the module.
17. Disconnect the chassis wiring harness electrical connectors (1) from the module and the fuel pressure sensor.
18. Completely lower the fuel tank.
19. With the aid of an assistant, place the fuel tank in a suitable work area.
20. If replacing the fuel tank proceed to the next step, otherwise proceed to step 18 in the installation procedure.
21. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
22. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
23. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
24. Remove the fuel feed line from the fuel tank.
25. Remove the fuel tank shield retainers (2 and 3) and shields (1 and 4).
26. Remove the EVAP line from the fuel tank clips (1, 2, 4, and 8).
27. Open the fuel tank clips (3, 5, 6, and 7) and remove the EVAP lines from the clips.
28. Disconnect the EVAP line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
29. Remove the EVAP lines from the fuel tank.
30. Using the J 45722 , remove the lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Carefully lift the module from the fuel tank, enough to access the quick connect fitting (1) under the module cover. Disconnect the quick connect fitting. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
32. Remove the fuel tank module.
33. Remove and discard the fuel tank module seal.
34. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
35. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
36. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 18.
2. Install a NEW fuel tank module seal onto the fuel tank.
3. Pull the vent line in the fuel tank up as far as possible for ease of installation.
4. Position the fuel tank module part way into the fuel tank.
5. Connect the quick connect fitting (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the fuel tank module into the fuel tank.
7. Place the lock ring into position.
8. Rotate the lock ring counterclockwise using the J 45722 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the EVAP lines to the fuel tank.
10. Connect the EVAP line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the EVAP lines to the fuel tank clips (3, 5, 6, and 7) and close the clips.
12. Install the EVAP line to the fuel tank clips (1, 2, 4, and 8).
13. Install the fuel tank shields (1 and 4) and retainers (2 and 3).
14. Install the fuel feed line to the fuel tank.
15. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
16. Install the fuel feed line to the clip (1) and close the clip.
17. Install the fuel feed line to the retaining feature (2) in the fuel tank.
18. Place the fuel tank onto a suitable jack.
19. With the aid of an assistant, partially raise the fuel tank until the electrical connections can be made.
20. Connect the chassis wiring harness electrical connectors (1) to the fuel tank module and fuel pressure sensor.
21. Engage the chassis harness electrical connector CPA retainer at the module electrical connector.
22. Completely raise the fuel tank.
23. Install the fuel tank straps.
24. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
25. Remove the adjustable jack from the fuel tank.
26. Connect the fuel tank EVAP line quick connect fitting (1) at the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
27. Remove the caps from the EVAP lines.
28. Connect the fuel tank EVAP lines (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
29. Remove the caps from the fuel and EVAP lines.
30. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
32. Connect the fuel tank vent line quick connect fitting (5) to the fuel fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
33. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
34. Tighten the fuel fill hose clamp (6). Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
35. Lower the vehicle.
36. Refill the fuel tank.
37. Install the fuel fill cap.
38. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
39. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
40. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

Note. Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Drain the fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fuel tank vent line quick connect fitting (5) from the fuel fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
7. Disconnect the fuel tank EVAP lines (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Cap the EVAP lines in order to prevent possible EVAP system contamination.
9. Using an adjustable jack, support the fuel tank.
10. Remove the fuel tank strap bolts.
11. Remove the fuel tank straps.
12. With the aid of an assistant, carefully lower the rear of the fuel tank.
13. Slide the front of the tank away from the frame.
14. Lower the fuel tank slightly until the chassis wiring harness electrical connectors can be accessed.
15. Disengage the chassis wiring harness electrical connector, connector position assurance (CPA) retainer at the module.
16. Disconnect the chassis wiring harness electrical connectors (1) from the module and the fuel pressure sensor.
17. Completely lower the fuel tank.
18. With the aid of an assistant, place the fuel tank in a suitable work area.
19. If replacing the fuel tank proceed to the next step, otherwise proceed to step 18 in the installation procedure.
20. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
21. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
22. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
23. Remove the fuel feed line from the fuel tank.
24. Remove the fuel tank shield retainers (2 and 3) and shields (1 and 4).
25. Remove the EVAP line from the fuel tank clips (2 and 6).
26. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
27. Disconnect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
28. Remove the EVAP lines from the fuel tank.
29. Using the J 45722 , remove the lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
30. Carefully lift the module from the fuel tank, enough to access the quick connect fittings (1) under the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Remove the fuel tank module.
32. Remove and discard the fuel tank module seal.
33. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
34. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
35. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 18.
2. Install the NEW fuel tank module seal onto the fuel tank.
3. Pull the vent lines in the fuel tank up as far as possible for ease of installation.
4. Position the fuel tank module part way into the fuel tank.
5. Connect the quick connect fittings (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the fuel tank module into the fuel tank.
7. Place the lock ring into position.
8. Rotate the lock ring counterclockwise using the J 45722 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the EVAP lines to the fuel tank.
10. Connect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
12. Install the EVAP line to the fuel tank clips (2 and 6).
13. Install the fuel tank shields (1 and 4) and retainers (2 and 3).
14. Install the fuel feed line to the fuel tank.
15. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
16. Install the fuel feed line to the clip (1) and close the clip.
17. Install the fuel feed line to the retaining feature (2) in the fuel tank.
18. Place the fuel tank onto a suitable jack.
19. With the aid of an assistant, partially raise the fuel tank until the electrical connections can be made.
20. Connect the chassis wiring harness electrical connectors (1) to the fuel tank module and fuel pressure sensor.
21. Engage the chassis harness electrical connector CPA retainer at the module electrical connector.
22. Completely raise the fuel tank.
23. Install the fuel tank straps.
24. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
25. Remove the adjustable jack from the fuel tank.
26. Remove the caps from the EVAP lines.
27. Connect the fuel tank EVAP lines (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
28. Remove the caps from the fuel and EVAP lines.
29. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
30. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Connect the fuel tank vent line quick connect fitting (5) to the fuel fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
32. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
33. Tighten the fuel fill hose clamp (6). Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
34. Lower the vehicle.
35. Refill the fuel tank.
36. Install the fuel fill cap.
37. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
38. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
39. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

Note. Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Drain the fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fuel tank vent line quick connect fitting (5) from the fuel fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
7. Disconnect the fuel tank EVAP lines (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Cap the EVAP lines in order to prevent possible EVAP system contamination.
9. Using an adjustable jack, support the fuel tank.
10. Remove the fuel tank strap bolts.
11. Remove the fuel tank straps.
12. With the aid of an assistant, carefully lower the rear of the fuel tank.
13. Slide the front of the tank away from the frame.
14. Lower the fuel tank slightly until the chassis wiring harness electrical connectors can be accessed.
15. Disengage the chassis wiring harness electrical connector, connector position assurance (CPA) retainer at the module.
16. Disconnect the chassis wiring harness electrical connectors (1) from the module and the fuel pressure sensor.
17. Completely lower the fuel tank.
18. With the aid of an assistant, place the fuel tank in a suitable work area.
19. If replacing the fuel tank proceed to the next step, otherwise proceed to step 18 in the installation procedure.
20. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
21. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
22. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
23. Remove the fuel feed line from the fuel tank.
24. Remove the fuel tank shield retainers (2 and 3) and shields (1 and 4).
25. Remove the EVAP line from the fuel tank clips (2 and 6).
26. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
27. Disconnect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
28. Remove the EVAP lines from the fuel tank.
29. Using the J 45722 , remove the lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
30. Carefully lift the module from the fuel tank, enough to access the quick connect fittings (1) under the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Remove the fuel tank module.
32. Remove and discard the fuel tank module seal.
33. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
34. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
35. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 18.
2. Install the NEW fuel tank module seal onto the fuel tank.
3. Pull the vent lines in the fuel tank up as far as possible for ease of installation.
4. Position the fuel tank module part way into the fuel tank.
5. Connect the quick connect fittings (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the fuel tank module into the fuel tank.
7. Place the lock ring into position.
8. Rotate the lock ring counterclockwise using the J 45722 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the EVAP lines to the fuel tank.
10. Connect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
12. Install the EVAP line to the fuel tank clips (2 and 6).
13. Install the fuel tank shields (1 and 4) and retainers (2 and 3).
14. Install the fuel feed line to the fuel tank.
15. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
16. Install the fuel feed line to the clip (1) and close the clip.
17. Install the fuel feed line to the retaining feature (2) in the fuel tank.
18. Place the fuel tank onto a suitable jack.
19. With the aid of an assistant, partially raise the fuel tank until the electrical connections can be made.
20. Connect the chassis wiring harness electrical connectors (1) to the fuel tank module and fuel pressure sensor.
21. Engage the chassis harness electrical connector CPA retainer at the module electrical connector.
22. Completely raise the fuel tank.
23. Install the fuel tank straps.
24. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
25. Remove the adjustable jack from the fuel tank.
26. Remove the caps from the EVAP lines.
27. Connect the fuel tank EVAP lines (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
28. Remove the caps from the fuel and EVAP lines.
29. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
30. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Connect the fuel tank vent line quick connect fitting (5) to the fuel fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
32. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
33. Tighten the fuel fill hose clamp (6). Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
34. Lower the vehicle.
35. Refill the fuel tank.
36. Install the fuel fill cap.
37. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
38. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
39. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

Note. Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Drain the fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fill pipe evaporative emission (EVAP) line quick connect fitting (2) from the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disconnect the EVAP line quick connect fitting (1) from the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disconnect the chassis fuel feed and EVAP line quick connect fittings from the fuel tank line quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Open the clip on the side of the fuel tank retaining the intermediate lines.
7. Disconnect the fuel and EVAP intermediate line quick connect fittings from the front tank lines. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Cap the fuel and EVAP lines in order to prevent possible fuel/EVAP system contamination.
9. Using an adjustable jack, support the fuel tank.
10. Remove the fuel tank strap bolts.
11. Remove the fuel tank straps.
12. With the aid of an assistant, carefully lower the fuel tank until the electrical connectors can be accessed.
13. Disengage the connector position assurance (CPA) retainer.
14. Disconnect the chassis harness electrical connector (1) from the fuel tank module.
15. Completely lower the fuel tank.
16. Place the fuel tank in a suitable work area.
17. If replacing the fuel tank proceed to the next step, otherwise proceed to step 14 in the installation procedure.
18. Remove the fuel tank shield retainers (1) and shield (2).
19. Remove the EVAP line from the fuel tank clip (1).
20. Open the fuel tank clips (2-7) and remove the fuel/EVAP lines from the clips.
21. Disconnect the fuel/EVAP line quick connect fittings from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
22. Remove the fuel/EVAP lines from the fuel tank.
23. Using the J 45722 remove the lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
24. Carefully lift the module from the fuel tank, enough to access the quick connect fitting (1) under the module cover. Disconnect the quick connect fitting. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
25. Remove the fuel tank module.
26. Remove and discard the fuel tank module seal.
27. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
28. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
29. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 14.
2. Install the NEW fuel tank module seal onto the fuel tank.
3. Pull the vent line in the fuel tank up as far as possible for ease of installation.
4. Position the fuel tank module part way into the fuel tank.
5. Connect the quick connect fitting (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the fuel tank module into the fuel tank.
7. Place the lock ring into position.
8. Rotate the lock ring counterclockwise using the J 45722 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the EVAP lines to the fuel tank.
10. Connect the EVAP line quick connect fittings at the fuel tank module. Refer to «Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank (1500 LWB - 117.3L (31 gal) Tank w/E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank (1500 LWB - 117.3L (31 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank (1500 LWB - 98.4L (26 gal) Tank w/E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Evaporative Emission Hoses/Pipes Replacement - Canister/Fuel Tank (2500 LWB - 43.5L (11.5 gal) Tank-Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the EVAP lines to the fuel tank clips (2-7) and close the clips.
12. Install the EVAP line to the fuel tank clip (1).
13. Install the fuel tank shield (2) and retainers (1).
14. Place the fuel tank onto a suitable jack.
15. With the aid of an assistant, partially raise the fuel tank.
16. Connect the chassis harness electrical connector (1) to the fuel tank module.
17. Engage the CPA retainer.
18. With the aid of an assistant, completely raise the fuel tank.
19. Install the fuel tank straps.
20. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
21. Remove the adjustable jack from under the fuel tank.
22. Remove the caps from the fuel and EVAP lines.
23. Connect the fuel and EVAP intermediate lines to the front tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
24. Install the lines to the clip on the side of the fuel tank and close the clip.
25. Connect the chassis fuel feed and EVAP line quick connect fittings to the fuel tank line quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction)
26. Connect the EVAP line quick connect fitting (1) to the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
27. Connect the fill pipe EVAP line quick connect fitting (2) to the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
28. Install the fuel fill hose to the fuel tank.
29. Tighten the fuel fill hose clamp at the fuel tank. Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
30. Lower the vehicle.
31. Refill the fuel tank.
32. Install the fuel fill cap.
33. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
34. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
35. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

Note. Clean the fuel and evaporative emission (EVAP) connections and surrounding areas prior to disconnecting the lines in order to avoid possible system contamination.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Drain the fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fuel tank vent line quick connect fitting (5) from the fuel fill pipe vent line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
7. Disconnect the fuel tank EVAP lines (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Cap the EVAP lines in order to prevent possible EVAP system contamination.
9. Disconnect the fuel tank EVAP line quick connect fitting (1) at the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Using an adjustable jack, support the fuel tank.
11. Remove the fuel tank strap bolts.
12. Remove the fuel tank straps.
13. With the aid of an assistant, carefully lower the rear of the fuel tank.
14. Slide the front of the tank away from the frame.
15. Lower the fuel tank slightly until the chassis wiring harness electrical connectors can be accessed.
16. Disengage the chassis wiring harness electrical connector, connector position assurance (CPA) retainer at the module.
17. Disconnect the chassis wiring harness electrical connectors (1) from the module and the fuel pressure sensor.
18. Completely lower the fuel tank.
19. With the aid of an assistant, Place the fuel tank in a suitable work area.
20. If replacing the fuel tank proceed to the next step, otherwise proceed to step 18 in the installation procedure.
21. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
22. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
23. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
24. Remove the fuel feed line from the fuel tank.
25. Remove the fuel tank shield retainers (2 and 3) and shields (1 and 4).
26. Remove the EVAP line from the fuel tank clips (2 and 6).
27. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
28. Disconnect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valves. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
29. Remove the EVAP lines from the fuel tank.
30. Using the J 45722 , remove the lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Carefully lift the module from the fuel tank, enough to access the quick connect fitting (1) under the module cover. Disconnect the quick connect fitting. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
32. Remove the fuel tank module.
33. Remove and discard the fuel tank module seal.
34. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
35. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
36. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced

1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 18.
2. Install the NEW fuel tank module seal onto the fuel tank.
3. Pull the vent lines in the fuel tank up as far as possible for ease of installation.
4. Position the fuel tank module part way into the fuel tank.
5. Connect the quick connect fittings (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the fuel tank module into the fuel tank.
7. Place the lock ring into position.
8. Rotate the lock ring counterclockwise using the J 45722 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the EVAP lines to the fuel tank.
10. Connect the EVAP line quick connect fittings at the fuel tank module and fuel tank vent valves. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
12. Install the EVAP line to the fuel tank clips (2 and 6).
13. Install the fuel tank shields (1 and 4) and retainers (2 and 3).
14. Install the fuel feed line to the fuel tank.
15. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
16. Install the fuel feed line to the clip (1) and close the clip.
17. Install the fuel feed line to the retaining feature (2) in the fuel tank.
18. Place the fuel tank onto a suitable jack.
19. With the aid of an assistant, partially raise the fuel tank until the electrical connections can be made.
20. Connect the chassis wiring harness electrical connectors (1) to the fuel tank module and fuel pressure sensor.
21. Engage the chassis harness electrical connector CPA retainer at the module electrical connector.
22. Completely raise the fuel tank.
23. Install the fuel tank straps.
24. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
25. Remove the adjustable jack from the fuel tank.
26. Connect the fuel tank EVAP line quick connect fitting (1) at the fuel tank vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
27. Remove the caps from the EVAP lines.
28. Connect the fuel tank EVAP lines (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
29. Remove the caps from the fuel and EVAP lines.
30. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
31. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
32. Connect the fuel tank vent line quick connect fitting (5) to the fuel fill pipe line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
33. Install the fuel fill hose to the fuel tank. Ensure that the notch in the hose is aligned with the notch on the fuel tank.
34. Tighten the fuel fill hose clamp (6). Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
35. Lower the vehicle.
36. Refill the fuel tank.
37. Install the fuel fill cap.
38. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
39. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
40. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

Note. Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Remove the spare tire stowage lock cylinder.
3. Remove the spare tire.
4. Drain the fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the rear exhaust insulator.
6. Remove the spare tire hoist crossmember bolts and crossmember.
7. Disconnect the rear fuel tank EVAP line quick connect fittings from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Disconnect the fuel and EVAP intermediate line quick connect fittings from the front tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Disconnect the chassis harness electrical connector (1) from the fuel pressure sensor.
10. Support the fuel tank with a suitable jack.
11. Remove the fuel tank strap bolts.
12. Remove the fuel tank straps.
13. With the aid of an assistant, lower the rear tank until the intermediate line connections can be reached.
14. Disconnect the fuel and EVAP intermediate line quick connect fittings from the rear tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
15. Remove the fuel and EVAP intermediate lines.
16. Cap the fuel and EVAP lines in order to prevent possible EVAP/fuel system contamination.
17. Disconnect the chassis harness electrical connector (2) from the fuel tank module.
18. Completely lower the fuel tank.
19. With the aid of an assistant, remove the tank from the jack.
20. If replacing the fuel tank proceed to the next step, otherwise proceed to step 14 in the installation procedure.
21. Remove the EVAP line from the clip (1) on the fuel tank.
22. Open the EVAP line clip (2) and remove the EVAP line from the clip.
23. Remove the EVAP lines from the clip (3).
24. Disconnect the EVAP line quick connect fittings from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
25. Remove the EVAP lines from the fuel tank.
26. Using the J 45722 , remove the lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
27. Carefully lift the module from the fuel tank, enough to access the quick connect fitting under the module cover. Disconnect the quick connect fitting. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
28. Remove the fuel tank module.
29. Remove and discard the fuel tank module seal.
30. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
31. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
32. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. If the fuel tank was replaced perform the following steps, otherwise proceed to step 14.
2. Install the NEW fuel tank module seal onto the fuel tank.
3. Pull the vent line in the fuel tank up as far as possible for ease of installation.
4. Position the fuel tank module part way into the fuel tank.
5. Connect the quick connect fittings to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the fuel tank module into the fuel tank.
7. Place the lock ring into position.
8. Rotate the lock ring counterclockwise using the J 45722 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the EVAP lines to the fuel tank.
10. Connect the EVAP line quick connect fittings to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the EVAP lines to the clip (3).
12. Install the EVAP line to the clip (2) and close the clip.
13. Install the EVAP line to the clip (1) on the fuel tank.
14. With the aid of an assistant, install the tank onto the jack.
15. Partially raise the fuel tank.
16. Connect the chassis harness electrical connector (2) to the fuel tank module.
17. Remove the caps from the fuel and EVAP lines.
18. Install the fuel and EVAP intermediate lines.
19. Connect the fuel and EVAP intermediate lines to the rear tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
20. With the aid of an assistant, completely raise the rear tank.
21. Install the fuel tank straps.
22. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
23. Remove the adjustable jack from under the fuel tank.
24. Connect the chassis harness electrical connector (1) to the fuel pressure sensor.
25. Connect the fuel and EVAP intermediate line quick connect fittings to the front tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
26. Connect the rear fuel tank EVAP line quick connect fittings to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
27. Install the spare tire hoist crossmember and bolts. Tighten: Tighten the bolts to 50 N.m (37 lb ft).
28. Install the rear exhaust insulator.
29. Install the fuel fill hose (1, 3) to the fuel tank.
30. Tighten the fuel fill hose clamp (2) at the fuel tank. Tighten: Tighten the clamp to 2.5 N.m (22 lb in).
31. Lower the vehicle.
32. Install the spare tire.
33. Install the spare tire stowage lock cylinder.
34. Install the fuel tank filler housing.
35. Install the fuel tank filler housing to fuel tank fill pipe bolts. Tighten: Tighten the bolts to 2.3 N.m (20 lb in).
36. Install the fuel tank filler housing to body TORX® screws (1) and retainer (2). Tighten: Tighten the screws to 2.3 N.m (20 lb in).
37. Refill the fuel tank.
38. Install the fuel fill cap.
39. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
40. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
41. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Using a slight rocking motion while pulling straight up, remove the fuel tank pressure sensor (1).

1. Install the fuel tank pressure sensor (1).
2. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the intermediate fuel and evaporative emission (EVAP) lines. Refer to «Fuel Hose/Pipes Assembly Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Hose/Pipes Assembly Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Hose/Pipes Assembly Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Hose/Pipes Assembly Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Gently pry straight up, in order to remove the fuel pressure sensor.

1. Lubricate the seal on the fuel pressure sensor.
2. Press the fuel pressure sensor into the line.
3. Install the intermediate fuel and EVAP lines. Refer to «Fuel Hose/Pipes Assembly Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Hose/Pipes Assembly Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Hose/Pipes Assembly Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Hose/Pipes Assembly Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Using a slight rocking motion while pulling straight up, remove the fuel tank pressure sensor (1).

1. Install the fuel tank pressure sensor (1).
2. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the evaporative emission (EVAP) line quick connect fitting from the vent valve and reposition the line out of the way. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Using a slight rocking motion while pulling straight up, remove the fuel tank pressure sensor (1).

1. Install the fuel tank pressure sensor (1).
2. Position the EVAP line and connect the EVAP line quick connect fitting to the vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

1. Remove the front fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the fuel and evaporative emission (EVAP) lines from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Using the J 45722 and a long breaker bar, rotate the ring clockwise unlocking the fuel tank module lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Remove the lock ring.
5. Carefully lift the fuel tank module from the fuel tank, enough to access the quick connect fitting (1) below the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the fuel tank module.
7. Remove and discard the fuel tank module seal.
8. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
9. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
10. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. Install the NEW fuel tank module seal onto the fuel tank.
2. Pull the vent line in the fuel tank up as far as possible for ease of installation.
3. Position the fuel tank module part way into the fuel tank.
4. Connect the quick connect fitting (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Install the fuel tank module into the fuel tank.
6. Place the lock ring into position.
7. Rotate the lock ring counterclockwise using the J 45722 until fully seated. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Connect the fuel and EVAP lines to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the front fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect fuel and evaporative emission (EVAP) lines from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the EVAP vent valve line quick connect fitting at the vent valve and reposition the line out of the way. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Using the J 45722 and a long breaker bar, rotate the ring clockwise unlocking the fuel tank module lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the lock ring.
6. Carefully lift the module from the fuel tank enough to access the quick connect fitting (1) under the module cover. Disconnect the quick connect fitting. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Remove the fuel tank module.
8. Remove and discard the fuel tank module seal.
9. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
10. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
11. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. Install the NEW fuel tank module seal onto the fuel tank.
2. Pull the vent line in the fuel tank up as far as possible for ease of installation.
3. Position the fuel tank module part way into the fuel tank.
4. Connect the quick connect fitting (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Install the fuel tank module into the fuel tank.
6. Place the lock ring into position.
7. Rotate the lock ring counterclockwise using the J 45722 until fully seated. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Position the EVAP vent valve line and connect the EVAP vent valve line quick connect fitting to the vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Connect the fuel and EVAP lines to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect fuel and evaporative emission (EVAP) lines from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Using the J 45722 and a long breaker bar, rotate the ring clockwise unlocking the fuel tank module lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Remove the lock ring.
5. Carefully lift the module from the fuel tank enough to access the quick connect fittings (1) under the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the fuel tank module.
7. Remove and discard the fuel tank module seal.
8. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
9. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
10. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. Install the NEW fuel tank module seal onto the fuel tank.
2. Pull the vent lines in the fuel tank up as far as possible for ease of installation.
3. Position the fuel tank module part way into the fuel tank.
4. Connect the quick connect fittings (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Install the fuel tank module into the fuel tank.
6. Place the lock ring into position.
7. Rotate the lock ring counterclockwise using the J 45722 until fully seated. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Connect the fuel and EVAP lines to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect fuel and evaporative emission (EVAP) lines from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Using the J 45722 and a long breaker bar, rotate the ring clockwise unlocking the fuel tank module lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Remove the lock ring.
5. Carefully lift the module from the fuel tank, enough to access the quick connect fitting (1) under the module cover. Disconnect the quick connect fitting. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the fuel tank module.
7. Remove and discard the fuel tank module seal.
8. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
9. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
10. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. Install a NEW fuel tank module seal onto the fuel tank.
2. Pull the vent line in the fuel tank up as far as possible for ease of installation.
3. Position the fuel tank module part way into the fuel tank.
4. Connect the quick connect fitting (1) to the module cover. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Install the fuel tank module into the fuel tank.
6. Place the lock ring into position.
7. Rotate the lock ring counterclockwise using the J 45722 until fully seated. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Connect the fuel and EVAP lines to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

J 45722 Fuel Sender Lock Ring Wrench. See Special Tools .

1. Remove the rear fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the evaporative emission (EVAP) line quick connect fittings from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Using the J 45722 and a long breaker bar, rotate the ring clockwise unlocking the fuel tank module lock ring. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Remove the lock ring.
5. Carefully lift the fuel tank module from the fuel tank enough to access the quick connect fittings below the module cover. Disconnect the quick connect fittings. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the fuel tank module.
7. Remove and discard the fuel tank module seal.
8. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gage at 7 points.
9. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
10. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.

1. Install a NEW fuel tank module seal onto the fuel tank.
2. Pull the vent lines in the tank up as far as possible for ease of installation.
3. Position the fuel tank module part way into the fuel tank.
4. Connect the quick connect fittings to the module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Install the module into the fuel tank.
6. Place the lock ring into position.
7. Rotate the lock ring counterclockwise using the J 45722 until fully seated. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Connect the EVAP line quick connect fittings to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Install the rear fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disengage the retainers and slide the fuel level sensor up.
3. Remove the fuel level sensor from the module.
4. Disconnect the fuel level sensor electrical connectors (1).

1. Connect the fuel level sensor electrical connectors (1).
2. Install the fuel level sensor to the module.
3. Position and slide the fuel level sensor down until the retainers engage the sensor.
4. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the fuel level sensor electrical connector (3) from under the module cover.
3. Release the level sensor retaining clip (1).
4. Slide the fuel level sensor (2) down off the bucket.

1. Slide the fuel level sensor (2) up onto the bucket until the sensor engages the retaining tab (1).
2. Connect the fuel level sensor electrical connector (3) under the module cover.
3. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the fuel level sensor electrical connector (1) from under the module cover.
3. Release the fuel level sensor retaining clip (1).
4. Slide the fuel level sensor down off of the bucket.

1. Slide the fuel level sensor up onto the bucket until the sensor engages the retaining tab (1).
2. Connect the fuel level sensor electrical connector (1) under the module cover.
3. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Using a small pick like tool, push in the retainer (1) in order to disengage the electrical connector.
3. Remove the fuel level sensor electrical connector from the module cover.
4. Push the level sensor locking tangs (2) in towards the inside of the module bucket.
5. Slide the fuel level sensor up.
6. Remove the fuel level sensor from the module.

1. Install the fuel level sensor to the module.
2. Position and slide the fuel level sensor down.
3. Ensure that the level sensor tangs (2) are engaged at the bucket.
4. Install the fuel level sensor electrical connector to the module cover.
5. Ensure that the retainer (1) engaged the module cover.
6. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
3. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
4. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the fuel feed line from the fuel tank.
6. Cap the fuel feed port on the fuel tank module in order to prevent possible fuel system contamination.

1. Install the fuel feed line to the fuel tank.
2. Remove the cap from the fuel feed port on the fuel tank module.
3. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Install the fuel feed line to the clip (1) and close the clip.
5. Install the fuel feed line to the retaining feature (2) in the fuel tank.
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
3. Open the fuel/evaporative emission (EVAP) line clip (1) and remove the fuel feed line from the clip.
4. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the fuel feed line from the fuel tank.
6. Cap the fuel feed port on the fuel tank module in order to prevent possible fuel system contamination.

1. Install the fuel feed line to the fuel tank.
2. Remove the cap from the fuel feed port on the fuel tank module.
3. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Install the fuel feed line to the clip (1) and close the clip.
5. Install the fuel feed line to the retaining feature (2) in the fuel tank.
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
3. Open the fuel/EVAP line clip (1) and remove the fuel feed line from the clip.
4. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the fuel feed line from the fuel tank.
6. Cap the fuel feed port on the fuel tank module in order to prevent possible fuel system contamination.

1. Install the fuel feed line to the fuel tank.
2. Remove the cap from the fuel feed port on the fuel tank module.
3. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Install the fuel feed line to the clip (1) and close the clip.
5. Install the fuel feed line to the retaining feature (2) in the fuel tank.
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel feed line from the retaining feature (2) in the fuel tank.
3. Open the fuel/evaporative emission (EVAP) line clip (1) and remove the fuel feed line from the clip.
4. Disconnect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the fuel feed line from the fuel tank.
6. Cap the fuel feed port on the fuel tank module in order to prevent possible fuel system contamination.

1. Install the fuel feed line to the fuel tank.
2. Remove the cap from the fuel feed port on the fuel tank module.
3. Connect the fuel feed line quick connect fitting at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Install the fuel feed line to the clip (1) and close the clip.
5. Install the fuel feed line to the retaining feature (2) in the fuel tank.
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

Note. Clean all fuel and evaporative emission (EVAP) lines connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Disconnect the engine evaporative emission (EVAP) line (1) quick connect fitting from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Cap the fuel rail and EVAP pipes.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
6. Unbolt and reposition the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
7. Disconnect the chassis wiring harness electrical connector (1) from the fuel pressure sensor.
8. Remove the fuel pipe bracket nut from the bellhousing stud.
9. Remove the fuel line clip from the bracket on the automatic transmission.
10. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe clip from the bracket on the transfer case.
11. Remove the fuel line bracket bolt (3).
12. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
13. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
14. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
15. Remove the fuel/EVAP line clips from the frame and crossmember.
16. Remove the fuel line bracket locator tab from the frame.
17. Remove the fuel/EVAP lines from the vehicle.

1. Install the fuel/EVAP lines to the vehicle.
2. Install the fuel line bracket locator tab to the frame.
3. Install the fuel/EVAP line clips to the frame and crossmember.
4. Install the fuel line bracket bolt (3). Tighten: Tighten the bolt to 12 N.m (106 lb in).
5. Remove the caps from the fuel and EVAP lines.
6. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. If equipped with 4WD, install the fuel hose/pipe clip to the bracket on the transfer case.
9. Install the fuel line clip to the bracket on the automatic transmission.
10. Install the fuel pipe bracket nut to the bellhousing stud. Tighten: Tighten the nut to 20 N.m (15 lb ft).
11. Position and install the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
12. Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor.
13. Lower the vehicle.
14. Remove the caps from the fuel rail and EVAP line.
15. Connect the engine EVAP line (1) quick connect fitting to the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
16. Connect the fuel feed line quick connect fitting (2) to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
17. Install the fuel fill cap.
18. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
19. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
20. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

Note. Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Disconnect the fuel feed pipe (2) quick connect fitting at the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the EVAP line (1) quick connect fitting from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Cap the fuel rail and EVAP line in order to prevent fuel/EVAP system contamination.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
6. Remove the fuel pipe bracket nut.
7. Remove the fuel pipe bracket from the bellhousing stud.
8. Remove the fuel line clip from the bracket on the automatic transmission.
9. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe clip from the bracket on the transfer case.
10. Remove the fuel line bracket nuts.
11. Remove the fuel/EVAP line bundle.

1. Install the fuel/EVAP line bundle.
2. Install the fuel line bracket nuts. Tighten: Tighten the bolt to 18 N.m (13 lb ft).
3. If equipped with 4WD, install the fuel hose/pipe clip to the bracket on the transfer case.
4. Install the fuel line clip to the bracket on the automatic transmission.
5. Install the fuel pipe bracket to the bellhousing stud.
6. Install the fuel pipe bracket nut. Tighten: Tighten the nut to 20 N.m (15 lb ft).
7. Lower the vehicle.
8. Remove the caps from the fuel rail and EVAP line.
9. Connect the EVAP line (1) quick connect fitting to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Connect the fuel feed line (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the fuel fill cap.
12. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
13. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
14. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disconnect the chassis wiring harness electrical connector (1) from the fuel pressure sensor.
3. Wrap a shop towel around the fuel pressure sensor fitting in order to absorb any fuel that may leak out.
4. Remove the fuel pressure sensor (1) from the fuel line.
5. Remove and discard the fuel pressure sensor O-ring seal (2).

1. Lubricate a NEW fuel pressure sensor O-ring seal with clean engine oil.
2. Install the NEW fuel pressure sensor O-ring seal (2) onto the fuel line fitting.
3. Wrap a shop towel around the fuel pressure sensor fitting in order to absorb any fuel that may leak out.
4. Install the fuel pressure sensor (1) to the fuel line. Tighten: Tighten the sensor to 15 N.m (11 lb ft).
5. Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor.
6. Lower the vehicle.
7. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.

Fuel System Cleaning

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Remove the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Inspect the fuel tank module strainer, if equipped. If the strainer is contaminated replace the fuel tank module.
4. Inspect the fuel tank module inlet for dirt and debris. Replace the fuel tank module if you find dirt or debris in the fuel pump inlet.
5. Flush the fuel tank with hot water.
6. Pour the water out of the fuel module opening. Rock the tank to be sure that removal of the water from the tank is complete.
7. Remove the fuel rail. Refer to «Fuel Injection Fuel Rail Assembly Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Drain the fuel from the fuel rail. It will be necessary to remove the fuel injectors from the fuel rail to properly clear all debris from the fuel rail and fuel injectors. Refer to «Fuel Injector Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Use light shop air to remove any debris from the fuel rail and injectors.
10. Use light shop air in the opposite direction of the fuel flow in order to remove any debris from the fuel lines. Catch any fuel from the fuel lines with an approved gasoline container.
11. Install the fuel injectors to the fuel rail. Refer to «Fuel Injector Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
12. Install the fuel rail. Refer to «Fuel Injection Fuel Rail Assembly Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
13. Install the fuel tank module. Refer to «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
14. Refill the fuel tank.
15. Install the fuel fill cap.
16. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
17. Purge the fuel tank module. Disconnect the fuel feed line quick connect fitting from the fuel tank to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) . Connect a length of hose to the fuel feed pipe. Insert the other end of the hose into an empty 3.8 liter (1 gallon) approved gasoline container. Add 23 liters (6 gallons) of clean fuel into the fuel tank. Turn on the fuel pump using the scan tool until 2 liters (1/2 gallon) of fuel flows into the fuel container.
18. Inspect for leaks. Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Inspect for fuel leaks.

Note. An 8-digit identification number is located on the fuel rail. Refer to this identification number when servicing or when part replacement is required.

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
3. Remove the engine wiring harness bracket nut (1).
4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid.
5. Disconnect the engine wiring harness electrical connector (3) from the generator.
6. Disconnect the engine wiring harness electrical connector (4) from the manifold absolute pressure (MAP) sensor.
7. Remove the connector position assurance (CPA) retainer (2).
8. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
9. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
10. Remove the CPA retainer (2).
11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
12. Disconnect the engine wiring harness electrical connector (3) from the electronic throttle control.
13. Disconnect the engine wiring harness electrical connectors (7) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
14. Remove the engine wiring harness clip (4) from the generator battery jumper cable.
15. Remove the engine wiring harness clip (6) from the ignition coil bracket stud.
16. Remove the negative battery cable stud (1) from the right cylinder head.
17. Remove the negative battery cable terminal (2) and engine wiring harness ground terminal (3) from the cylinder head.
18. Remove the engine wiring harness clip bolt (3) from the generator bracket.
19. Gather the branches of the engine wiring harness and reposition the aside.
20. Remove the positive crankcase ventilation (PCV) hose.
21. Disconnect the chassis fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
22. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
23. Disconnect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
24. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
25. Remove the EVAP tube and purge solenoid.
26. Remove the fuel rail bolts.
27. Remove the fuel rail assembly.
28. Remove the fuel injector retainers (1).
29. Remove the fuel injectors (3) from the fuel rail.
30. Remove and discard the fuel injector upper and lower O-ring seals (2 and 4).

1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
2. Install the NEW fuel injector upper and lower O-ring seals (2 and 4) onto the injectors.
3. Install the fuel injectors (3) into the fuel rails.
4. Install the fuel injector retainers (1).
5. Ensure the fuel injector lower O-ring seals are adequately lubricated, if not lubricate the fuel injector lower O-ring seals with clean engine oil.
6. Position the fuel rail onto the intake manifold.
7. Firmly push down on both the centers of the left and right fuel rails, until the rails are fully seated against the intake manifold.
8. Install the fuel rail bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
9. Install the EVAP tube and purge solenoid.
10. Install the EVAP canister purge solenoid to the fuel rail bracket and engage the retainer.
11. Connect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
12. Connect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
13. Connect the chassis fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
14. Install the PCV hose.
15. Gather the branches of the engine wiring harness and position over the top of the engine.
16. Position the engine wiring harness clip to the generator bracket and install the clip bolt (3). Tighten: Tighten the bolt to 9 N.m (80 lb in).
17. Position the negative battery cable terminal (2) and engine wiring harness ground terminal (3) to the right cylinder head.
18. Install the negative battery cable stud (1) to the cylinder head. Tighten: Tighten the stud to 25 N.m (18 lb ft).
19. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
20. Install the CPA retainer (2).
21. Connect the engine wiring harness electrical connector (3) to the electronic throttle control.
22. Connect the engine wiring harness electrical connectors (7) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
23. Install the engine wiring harness clip (4) to the generator battery jumper cable.
24. Install the engine wiring harness clip (6) to the ignition coil bracket stud.
25. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
26. Install the CPA retainer (2).
27. Connect the engine wiring harness electrical connectors (3) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
28. Connect the engine wiring harness electrical connector (4) to the MAP sensor.
29. Connect the engine wiring harness electrical connector (3) to the generator.
30. Connect the engine wiring harness electrical connector (2) to the EVAP purge solenoid.
31. Install the engine wiring harness bracket nut (1). Tighten: Tighten the nut to 5 N.m (44 lb in).
32. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
33. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for leaks.
34. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

Note. An 8-digit identification number is located on the fuel rail. Refer to this identification number when servicing or when part replacement is required. The engine oil may be contaminated with fuel if the fuel injectors are leaking.

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
3. Remove the engine wiring harness bracket nut (1).
4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid.
5. Disconnect the engine wiring harness electrical connector (3) from the generator.
6. Disconnect the engine wiring harness electrical connector (4) from the manifold absolute pressure (MAP) sensor.
7. Remove the connector position assurance (CPA) retainer (2).
8. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
9. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
10. Remove the CPA retainer (2).
11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
12. Disconnect the engine wiring harness electrical connector (3) from the electronic throttle control.
13. Disconnect the engine wiring harness electrical connectors (7) from the fuel injectors, perform the following: Mark the connectors to their corresponding injectors to ensure correct reassembly. Pull the CPA retainer on the connector up 1 click. Push the tab on the connector in. Disconnect the fuel injector electrical connector.
14. Remove the engine wiring harness clip (4) from the generator battery jumper cable.
15. Remove the engine wiring harness clip (6) from the ignition coil bracket stud.
16. Remove the negative battery cable stud (1) from the right cylinder head.
17. Remove the negative battery cable terminal (2) and engine wiring harness ground terminal (3) from the cylinder head.
18. Remove the engine wiring harness clip bolt (3) from the generator bracket.
19. Gather the branches of the engine wiring harness and reposition the aside.
20. Remove the positive crankcase ventilation (PCV) hose.
21. Disconnect the chassis fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
22. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
23. Disconnect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
24. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
25. Remove the EVAP tube and purge solenoid.
26. Remove the fuel rail bolts.
27. Remove the fuel rail assembly.
28. Remove the fuel injector retainers (1).
29. Remove the fuel injectors (3) from the fuel rail.
30. Remove and discard the fuel injector upper and lower O-ring seals (2 and 4).

1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
2. Install the NEW fuel injector upper and lower O-ring seals (2 and 4) onto the injectors.
3. Install the fuel injectors (3) into the fuel rails.
4. Install the fuel injector retainers (1).
5. Ensure the fuel injector lower O-ring seals are adequately lubricated, if not lubricate the fuel injector lower O-ring seals with clean engine oil.
6. Position the fuel rail onto the intake manifold.
7. Firmly push down on both the centers of the left and right fuel rails, until the rails are fully seated against the intake manifold.
8. Install the fuel rail bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
9. Install the EVAP tube and purge solenoid.
10. Install the EVAP canister purge solenoid to the fuel rail bracket and engage the retainer.
11. Connect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
12. Connect the EVAP tube quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
13. Connect the chassis fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
14. Install the PCV hose.
15. Gather the branches of the engine wiring harness and position over the top of the engine.
16. Position the engine wiring harness clip to the generator bracket and install the clip bolt (3). Tighten: Tighten the bolts to 9 N.m (80 lb in).
17. Position the negative battery cable terminal (2) and engine wiring harness ground terminal (3) to the right cylinder head.
18. Install the negative battery cable stud (1) to the cylinder head. Tighten: Tighten the stud to 25 N.m (18 lb ft).
19. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
20. Install the CPA retainer (2).
21. Connect the engine wiring harness electrical connector (3) to the electronic throttle control.
22. Connect the engine wiring harness electrical connectors (7) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
23. Install the engine wiring harness clip (4) to the generator battery jumper cable.
24. Install the engine wiring harness clip (6) to the ignition coil bracket stud.
25. Connect the engine wiring harness electrical connector (1) to the ignition coil main electrical connector.
26. Install the CPA retainer (2).
27. Connect the engine wiring harness electrical connectors (3) to the fuel injectors, perform the following: Ensure that the CPA retainer is pulled out 1 click. Connect the electrical connectors to their corresponding injectors. Push the CPA retainer in 1 click. Ensure that the connector is secured.
28. Connect the engine wiring harness electrical connector (4) to the MAP sensor.
29. Connect the engine wiring harness electrical connector (3) to the generator.
30. Connect the engine wiring harness electrical connector (2) to the EVAP purge solenoid.
31. Install the engine wiring harness bracket nut (1). Tighten: Tighten the nut to 5 N.m (44 lb in).
32. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
33. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for leaks.
34. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

Fuel Injector Cleaning

Special Tools

1. J 37287 Fuel Line Shut-Off Adapters. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. J 35800-A Fuel Injector Cleaner. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. J 42873-1 3/8 Fuel Line Shut-Off Valve. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. J 42873-2 5/16 Return Pipe Shut-Off Valve. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. J 42964-1 3/8 Fuel Pipe Shut-Off Valve. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. J 42964-2 5/16 Fuel Pipe Shut-Off Valve. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

Note. Vehicles with less than 160 km (100 mi) on the odometer should not have the injectors cleaned. These vehicles should have the injectors replaced.

1. Obtain J 35800-A (2). See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. For 4, 5, and 6 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner twin reservoir container into the J 35800-A , injector cleaning tank, then add 420 ml (14 oz) of regular unleaded gasoline. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) . If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of GM Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline.
3. For 8 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner twin reservoir container into the J 35800-A , injector cleaning tank, then add 420 ml (14 oz) of regular unleaded gasoline. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) . If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of GM Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline. This procedure will need to be repeated for an 8 cylinder engine. The 8 cylinder engines receive 960 ml total fluid-120 ml (4 oz) of GM Upper Engine and Fuel Injector Cleaner and 840 ml (28 oz) of gasoline.
4. Fill the injector cleaning tank with regular unleaded gasoline. Be sure to follow all additional instructions provided with the tool.
5. Electrically disable the vehicle fuel pump by removing the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.
6. Disconnect the fuel feed and return line, if equipped, at the fuel rail. Plug the fuel feed and return line, if equipped, coming off the fuel rail with J 37287 , or J 42964-1 , and J 42964-2 or J 42873-1 , and J 42873-2 as appropriate for the fuel system. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Connect the J 35800-A to the vehicle fuel rail. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Pressurize the J 35800-A to 510 kPa (75 psi). See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Start and idle the engine until it stalls due to lack of fuel. This should take approximately 15-20 minutes.
10. Turn the ignition to the OFF position.
11. Injectors should be flow-tested at this point. If further cleaning is needed, a repeat of the above procedure should be done. When the injector restriction returns to zero, proceed to step 12.
12. Disconnect the J 35800-A from the fuel rail. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
13. Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped.
14. Remove the J 37287 , or J 42964-1 and J 42964-2 , or J 42873-1 and J 42873-2 and reconnect the vehicle fuel feed and return lines. See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
15. Start and idle the vehicle for an additional two minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines.
16. Pour the entire contents of GM Fuel System Treatment Plus, GM P/N 88861011 (Canadian P/N 88861012) into a nearly empty tank and advise the customer to refuel with up to 76 L (20 gal) of fuel.
17. Advise the customer to use only a Top Tier Detergent gasoline and to add a bottle of GM Fuel System Treatment Plus to the fuel tank at every oil change. Regular use of GM Fuel System Treatment Plus should keep the customer from having to repeat the injector cleaning procedure.
18. Road test the vehicle to verify that the customer concern has been corrected.

1. Remove the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Disconnect the EVAP line quick connect fitting from the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the engine wiring harness electrical connector (2) from the EVAP canister purge solenoid.
4. Disconnect the chassis EVAP line quick connect fitting from the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
6. Remove the EVAP canister purge solenoid.

1. Install the EVAP canister purge solenoid.
2. Install the EVAP canister purge solenoid to the fuel rail and engage the retainer.
3. Connect the engine wiring harness electrical connector (2) to the EVAP canister purge solenoid.
4. Connect the chassis EVAP line quick connect fitting to the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Connect the EVAP line quick connect fitting to the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the air cleaner outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the spare tire and wheel assembly.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
3. Disconnect the chassis wiring harness electrical connector (1) from the EVAP canister vent solenoid.
4. Disconnect the EVAP canister vent solenoid quick connect fitting (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Disconnect the fuel fill pipe EVAP line quick connect fitting (3) from the vent solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Disengage the retainer (1) securing the EVAP canister vent solenoid to the bracket.
7. Remove the EVAP canister vent solenoid.

1. Install the EVAP canister vent solenoid.
2. Slide the EVAP canister vent solenoid onto the bracket until the retainer (1) engages the clip.
3. Connect the EVAP canister vent solenoid quick connect fitting (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Connect the fuel fill pipe EVAP line quick connect fitting (3) to the vent solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Connect the chassis wiring harness electrical connector (1) to the EVAP canister vent solenoid.
6. Lower the vehicle.
7. Install the spare tire and wheel assembly.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disconnect the chassis wiring harness electrical connector (1) from the EVAP canister vent solenoid.
3. Disconnect the EVAP canister vent solenoid line quick connect fitting from the vent solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disengage the retainer (1) securing the EVAP canister vent solenoid to the bracket.
5. Remove the EVAP canister vent solenoid.

1. Install the EVAP canister vent solenoid.
2. Slide the EVAP canister vent solenoid onto the bracket until the retainer (1) engages the clip.
3. Connect the EVAP canister vent solenoid line quick connect fitting to the vent solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Connect the chassis wiring harness electrical connector (1) to the EVAP canister vent solenoid.
5. Lower the vehicle.

Note. Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the spare tire stowage lock cylinder.
3. Remove the spare tire.
4. Drain the rear fuel tank. Refer to «Fuel Tank Draining (Dual Tanks - Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Draining (Single Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-tank-draining-single-tank) or «Fuel Tank Draining (Dual Tanks - Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the rear exhaust insulator.
6. Remove the spare tire hoist crossmember bolts and crossmember.
7. Disconnect the rear fuel tank EVAP line quick connect fittings from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. Disconnect the fuel and EVAP intermediate line quick connect fittings from the front tank lines. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
9. Disconnect the chassis harness electrical connector (1) from the fuel pressure sensor.
10. Support the fuel tank with a suitable jack.
11. Remove the fuel tank strap bolts.
12. Remove the fuel tank straps.
13. With the aid of an assistant, lower the rear tank until the intermediate line connections can be reached.
14. Disconnect the fuel and EVAP intermediate line quick connect fittings from the rear tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
15. Remove the fuel and EVAP intermediate line assembly.
16. Cap the fuel and EVAP lines in order to prevent possible EVAP/fuel system contamination.

1. Remove the caps from the fuel and EVAP lines.
2. Install the fuel and EVAP intermediate lines.
3. Connect the fuel and EVAP intermediate line quick connect fittings to the rear tank. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. With the aid of an assistant, completely raise the rear tank.
5. Install the fuel tank straps.
6. Install the fuel tank strap bolts. Tighten: Tighten the bolts to 40 N.m (30 lb ft).
7. Remove the adjustable jack from under the fuel tank.
8. Connect the chassis harness electrical connector (1) to the fuel pressure sensor.
9. Connect the fuel and EVAP intermediate line quick connect fittings to the front tank lines. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Connect the rear tank EVAP line quick connect fittings to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the spare tire hoist crossmember and bolts. Tighten: Tighten the bolts to 50 N.m (37 lb ft).
12. Install the rear exhaust insulator.
13. Install the spare tire.
14. Install the spare tire stowage lock cylinder.
15. Install the fuel tank filler housing.
16. Install the fuel tank filler housing to fuel tank fill pipe bolts. Tighten: Tighten the bolts to 2.3 N.m (20 lb in).
17. Install the fuel tank filler housing to body TORX® screws (1) and retainer (2). Tighten: Tighten the screws to 2.3 N.m (20 lb in).
18. Refill the fuel tank.
19. Install the fuel fill cap.
20. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
21. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
22. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel tank shield retainers (1) and shield (2).
3. Remove the EVAP line from the fuel tank clip (1).
4. Open the fuel tank clips (2-7) and remove the fuel/EVAP lines from the clips.
5. Disconnect the fuel/EVAP line quick connect fittings from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the fuel/EVAP lines from the fuel tank.

1. Install the fuel/EVAP lines to the fuel tank.
2. Connect the fuel/EVAP line quick connect fittings at the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the fuel/EVAP lines to the fuel tank clips (2-7) and close the clips.
4. Install the fuel/EVAP line to the fuel tank clip (1).
5. Install the fuel tank shield (2) and retainers (1).
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the upper intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .
2. Disconnect the EVAP line quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the EVAP line quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Connect the EVAP line quick connect fitting at the EVAP canister purge solenoid. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Connect the EVAP line quick connect fitting at the intake manifold. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the upper intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

Note. Clean all fuel and evaporative emission (EVAP) lines connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Disconnect the EVAP line (1) quick connect fitting from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Cap the fuel rail and EVAP pipes.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
6. Unbolt and reposition the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
7. Disconnect the chassis wiring harness electrical connector (1) from the fuel pressure sensor.
8. Remove the fuel pipe bracket nut from the bellhousing stud.
9. Remove the fuel line clip from the bracket on the automatic transmission.
10. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe clip from the bracket on the transfer case.
11. Remove the fuel line bracket bolt (3).
12. Disconnect the chassis EVAP line quick connect fitting (4) from the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
13. Disconnect the fuel tank fuel feed line quick connect fitting (5) from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
14. Cap the fuel and EVAP lines in order to prevent possible fuel and/or EVAP system contamination.
15. Remove the fuel/EVAP line clips from the frame and crossmember.
16. Remove the fuel line bracket locator tab from the frame.
17. Remove the fuel/EVAP lines from the vehicle.

1. Install the fuel/EVAP lines to the vehicle.
2. Install the fuel line bracket locator tab to the frame.
3. Install the fuel/EVAP line clips to the frame and crossmember.
4. Install the fuel line bracket bolt (3). Tighten: Tighten the bolt to 12 N.m (106 lb in).
5. Remove the caps from the fuel and EVAP lines.
6. Connect the chassis EVAP line quick connect fitting (4) to the fuel tank line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
7. Connect the fuel tank fuel feed line quick connect fitting (5) to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
8. If equipped with 4WD, install the fuel hose/pipe clip to the bracket on the transfer case.
9. Install the fuel line clip to the bracket on the automatic transmission.
10. Install the fuel pipe bracket nut to the bellhousing stud. Tighten: Tighten the nut to 20 N.m (15 lb ft).
11. Position and install the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/driveshaft-universal-joints/#propeller-shaft-and-universal-joints) .
12. Connect the chassis wiring harness electrical connector (1) to the fuel pressure sensor.
13. Lower the vehicle.
14. Remove the caps from the fuel rail and EVAP line.
15. Disconnect the EVAP line (1) quick connect fitting from the chassis EVAP line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
16. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
17. Install the fuel fill cap.
18. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
19. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
20. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

Note. Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief (With CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Pressure Relief (Without CH-48027)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__fuel-pressure-relief-without-ch-48027) .
2. Disconnect the fuel feed pipe (2) quick connect fitting at the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the EVAP line (1) quick connect fitting from the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Cap the fuel rail and EVAP line in order to prevent fuel/EVAP system contamination.
5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
6. Remove the fuel pipe bracket nut.
7. Remove the fuel pipe bracket from the bellhousing stud.
8. Remove the fuel line clip from the bracket on the automatic transmission.
9. If equipped with 4-wheel drive (4WD), remove the fuel hose/pipe clip from the bracket on the transfer case.
10. Remove the fuel line bracket nuts.
11. Remove the fuel/EVAP line bundle.

1. Install the fuel/EVAP line bundle.
2. Install the fuel line bracket nuts. Tighten: Tighten the bolt to 18 N.m (13 lb ft).
3. If equipped with 4WD, install the fuel hose/pipe clip to the bracket on the transfer case.
4. Install the fuel line clip to the bracket on the automatic transmission.
5. Install the fuel pipe bracket to the bellhousing stud.
6. Install the fuel pipe bracket nut. Tighten: Tighten the nut to 20 N.m (15 lb ft).
7. Lower the vehicle.
8. Remove the caps from the fuel rail and EVAP line.
9. Connect the EVAP line (1) quick connect fitting to the chassis line. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Connect the fuel feed line (2) quick connect fitting to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
11. Install the fuel fill cap.
12. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
13. Use the following procedure in order to inspect for leaks: Turn the ignition ON, with the engine OFF, for 2 seconds. Turn the ignition OFF for 10 seconds. Turn the ignition ON, with the engine OFF. Inspect for fuel leaks.
14. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel tank shield retainers (2, and 3) and shields (1, and 4).
3. Remove the EVAP lines from the fuel tank clips (1, 2, 4 and 8).
4. Open the fuel tank clips (3, 5, 6, and 7) and remove the EVAP lines from the clips.
5. Disconnect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the EVAP lines from the fuel tank.

1. Install the EVAP lines to the fuel tank.
2. Connect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the EVAP lines to the fuel tank clips (3, 5, 6, and 7) and close the clips.
4. Install the EVAP lines to the fuel tank clips (1, 2, 4 and 8).
5. Install the fuel tank shields (1, and 4) and retainers (2, and 3).
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel tank shield retainers (2, and 3) and shields (1, and 4).
3. Remove the EVAP lines from the fuel tank clips (2, and 6).
4. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
5. Disconnect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the EVAP lines from the fuel tank.

1. Install the EVAP lines to the fuel tank.
2. Connect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
4. Install the EVAP lines to the fuel tank clips (2, and 6).
5. Install the fuel tank shields (1, and 4) and retainers (2, and 3).
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel tank shield retainers (2, and 3) and shields (1, and 4).
3. Remove the EVAP line from the fuel tank clips (2, and 6).
4. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
5. Disconnect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the EVAP lines from the fuel tank.

1. Install the EVAP lines to the fuel tank.
2. Connect the EVAP line quick connect fittings at the fuel tank module and vent valve. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
4. Install the EVAP line to the fuel tank clips (2, and 6).
5. Install the fuel tank shields (1, and 4) and retainers (2, and 3).
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the fuel tank shield retainers (2, and 3) and shields (1, and 4).
3. Remove the EVAP lines from the fuel tank clips (2, and 6).
4. Open the fuel tank clips (1, 3, 4, and 5) and remove the EVAP lines from the clips.
5. Disconnect the EVAP line quick connect fittings at the fuel tank module and vent valves. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the EVAP lines from the fuel tank.

1. Install the EVAP lines from the fuel tank.
2. Connect the EVAP line quick connect fittings at the fuel tank module and vent valves. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the EVAP lines to the fuel tank clips (1, 3, 4, and 5) and close the clips.
4. Install the EVAP lines to the fuel tank clips (2, and 6).
5. Install the fuel tank shields (1, and 4) and retainers (2, and 3).
6. Install the fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Remove the rear fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the EVAP line from the clip (1) on the fuel tank.
3. Open the EVAP line clip (2) and remove the EVAP line from the clip.
4. Remove the EVAP lines from the clip (3).
5. Disconnect the EVAP line quick connect fittings from the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Remove the EVAP lines from the fuel tank.

1. Install the EVAP lines to the fuel tank.
2. Connect the EVAP line quick connect fittings to the fuel tank module. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Install the EVAP lines to the clip (3).
4. Install the EVAP line to the clip (2) and close the clip.
5. Install the EVAP line to the clip (1) on the fuel tank.
6. Install the rear fuel tank. Refer to «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 LWB - 117.3L (31 gal) Tank )»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 98.4L (26 gal) Tank Front)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (1500 SWB - 98.4L (26 gal) Tank + E85)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Fuel Tank Replacement (2500 LWB - 4.35L (11.5 gal) Tank Rear)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

Note. Clean all evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting, in order to avoid possible EVAP system contamination.

1. Remove the right side, rear bumper step pad. Refer to «Rear Bumper Step Outer Pad Replacement (Avalanche, Cadillac EXT)»(/chevrolet/avalanche/ii-2006-2013/remont/exterior-body-panels/#bumper-system-fascia) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
3. Disconnect the chassis wiring harness electrical connector (1) from the EVAP canister vent solenoid.
4. Disconnect the rear fuel tank EVAP canister quick connect fittings from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the EVAP canister bolt.
6. Lower the vehicle half way.
7. Loosen the EVAP canister bracket nuts (1).
8. Using a flat bladed screwdriver, disengage the front bracket clip.
9. Using a flat bladed screwdriver, disengage the rear bracket clip.
10. Remove the EVAP canister.
11. Cap the EVAP lines in order to prevent possible EVAP system contamination.
12. Disconnect the EVAP canister vent solenoid line (1) quick connect fitting at the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .

1. Connect the EVAP canister vent solenoid line (1) quick connect fitting at the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Remove the caps from the EVAP lines.
3. Install the EVAP canister.
4. Using a flat bladed screwdriver, engage the rear bracket clip.
5. Using a flat bladed screwdriver, engage the front bracket clip.
6. Tighten the EVAP canister bracket nuts (1). Tighten: Tighten the nuts to 25 N.m (18 lb ft).
7. Raise the vehicle.
8. Install the EVAP canister bolt. Tighten: Tighten the nuts to 25 N.m (18 lb ft).
9. Connect the rear fuel tank EVAP canister quick connect fittings to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Connect the EVAP canister vent solenoid (CVS) electrical connector (1).
11. Lower the vehicle.
12. Install the right side, rear bumper step pad. Refer to «Rear Bumper Step Outer Pad Replacement (Avalanche, Cadillac EXT)»(/chevrolet/avalanche/ii-2006-2013/remont/exterior-body-panels/#bumper-system-fascia) .

Note. Clean all evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting, in order to avoid possible EVAP system contamination.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Remove the EVAP canister bracket bolts and lower the EVAP canister.
3. Disconnect the fuel tank EVAP line quick connect fittings (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
4. Disconnect the EVAP canister vent solenoid quick connecting fitting (1) from the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Remove the EVAP canister.
6. If necessary, remove the EVAP canister to bracket bolt.
7. If necessary, remove the EVAP canister from the bracket.

1. If necessary, install the EVAP canister to the bracket.
2. If necessary, install the EVAP canister to bracket bolt. Tighten: Tighten the bolt to 25 N.m (18 lb ft).
3. Position the EVAP canister.
4. Connect the EVAP canister vent solenoid quick connecting fitting (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
5. Connect the fuel tank EVAP line quick connect fittings (1) to the EVAP canister. Refer to «Plastic Collar Quick Connect Fitting Service»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
6. Install the EVAP canister bracket bolts. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
7. Lower the vehicle.

Tools Required

J 41413-200 Evaporative Emissions System Tester (EEST). See Special Tools .

Inspection Procedure

1. Turn OFF the ignition.
2. Remove the EVAP canister purge solenoid valve. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Lightly tap the EVAP canister purge solenoid valve on a clean hard surface.
4. Inspect for carbon particles exiting either of the vacuum ports. If no carbon particles are found reinstall the EVAP canister purge solenoid valve and continue with the EVAP cleaning procedure. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) . If carbon particles are found during the inspection procedure, replace the EVAP canister purge solenoid valve and continue with the EVAP cleaning procedure. Refer to «Evaporative Emission Canister Purge Solenoid Valve Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) . If you were instructed to replace the EVAP canister purge solenoid valve, and no carbon particles are found, return to the EVAP diagnostic procedure. Do not perform the EVAP cleaning procedure.

EVAP Cleaning Procedure

1. Remove the EVAP canister. Refer to «Evaporative Emission Canister Replacement (2500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Evaporative Emission Canister Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
2. Turn OFF the main valve on the J 41413-200 . See «Special Tools»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
3. Disconnect the hose from the diagnostic station pressure regulator.
4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.
5. Connect the other end of the vacuum hose to the canister side of the purge pipe.
6. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
7. If the nitrogen does not dislodge the carbon particles, replace the purge pipe.
8. Return the EVAP pressure/purge diagnostic station to the stations original condition.
9. Install a new EVAP canister. Refer to «Evaporative Emission Canister Replacement (2500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) or «Evaporative Emission Canister Replacement (1500 Series)»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction) .
10. Connect all previously disconnected EVAP pipe connectors.
11. Lower the vehicle.
12. Continue with the published service manual diagnostic DTC procedure.

1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .
2. Disconnect the ignition coil wiring harness electrical connector (1) from the ignition coil.
3. Remove the spark plug wire from the ignition coil. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.
4. Remove the ignition coil bolts.
5. Remove the ignition coil from the bracket. (left side shown, right side similar).
6. There are 2 different manufacturers for the ignition coils and coil brackets. They are as follows
7. The Melco® (1) ignition coil is a square design.
8. The Delphi® (2) ignition coil is a round design.
9. The Melco® ignition coil bracket (1) is a square design.
10. The Delphi® ignition coil bracket (2) is a round design.

1. Position the ignition coil to the ignition coil bracket. (left side shown, right side similar).
2. Install the ignition coil bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
3. Install the spark plug wire to the ignition coil.
4. Inspect the spark plug wire for proper installation: Push sideways on each boot in order the inspect the seating. Reinstall any loose boot.
5. Connect the ignition coil wiring harness electrical connector (1) to the ignition coil.
6. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

Spark Plug Wire Inspection

Spark plug wire integrity is vital for proper engine operation. A thorough inspection is necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions

1. Correct routing of the spark plug wires, Incorrect routing may cause cross firing.
2. Any signs of cracks or splits in the wires.
3. Inspect each boot for any of the following conditions: Tearing Piercing Arcing Carbon tracking Corroded terminal

If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or terminal, replace the wire and the component connected to the wire.

1. Remove the spark plug wire from the spark plug. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug.
2. Remove the spark plug wire from the ignition coil. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.

1. Install the spark plug wire to the ignition coil.
2. Install the spark plug wire to the spark plug.
3. Inspect the spark plug wire for proper installation: Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.

Spark Plug Inspection

1. Verify that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to «Ignition System Specifications»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__ignition-system-specifications) for the correct spark plug.
2. Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions: Spark plug fouling, replace with a colder plug Pre-ignition causing spark plug and/or engine damage , replace with a hotter plug
3. Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1). Test for a loose terminal post (1) by twisting and pulling the post. The terminal post (1) should not move.
4. Inspect the insulator (2) for flashover or carbon tracking, or soot. This is caused by the electrical charge traveling across the insulator (2) between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. Inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated will cause arcing to ground.
5. Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3, 4).
6. Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3). Refer to «Ignition System Specifications»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__ignition-system-specifications) . An excessively wide electrode gap can prevent correct spark plug operation. Inspect for the correct spark plug torque. Refer to «Ignition System Specifications»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__ignition-system-specifications) . Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). Inspect for a broken or worn side electrode (3). Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. A loose center electrode (4) reduces the spark intensity. Inspect for bridged electrodes (3, 4). Deposits on the electrodes (3, 4) reduce or eliminates the gap. Inspect for worn or missing platinum pads on the electrodes (3, 4), if equipped. Inspect for excessive fouling.
7. Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation.

Visual Inspection

1. Normal operation - Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives.
2. Carbon fouled - Dry, fluffy black carbon, or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors Excessive fuel pressure Restricted air filter element Incorrect combustion Reduced ignition system voltage output Weak ignition coils Worn ignition wires Incorrect spark plug gap Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
3. Deposit fouling - Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark plug intensity. Most powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode.

1. Remove the spark plug wire from the spark plug. Twist the spark plug wire boot a 1/2 turn. Pull only on the boot in order to remove the wire from the spark plug.
2. Brush or using compressed air, blow away any dirt from around the spark plug.
3. Remove the spark plug. If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number.

1. Correctly position the spark plug washer.
2. Inspect the spark plug gap. Adjust the gap as needed. Refer to «Ignition System Specifications»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__ignition-system-specifications)
3. Hand start the spark plug in the corresponding cylinder.
4. Tighten the spark plug. Tighten: Tighten the plug to 15 N.m (11 lb ft).
5. Install the spark plug wire to the spark plug.
6. Inspect the spark plug wire for proper installation: Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.

Note. Perform the Crankshaft Position System Variation Learn whenever the crankshaft position sensor is removed or replaced.

1. Remove the starter. Refer to «Starter Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
2. Working through the wheel well opening, disconnect the engine wiring harness electrical connector (1) from the crankshaft position (CKP) sensor.
3. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine.
4. Remove the CKP sensor bolt.
5. Remove the CKP sensor.

1. Install the CKP sensor.
2. Install the CKP sensor bolt. Tighten: Tighten the bolt to 25 N.m (18 lb ft).
3. Connect the engine wiring harness electrical connector (1) to the CKP sensor.
4. Install the starter. Refer to «Starter Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
5. Perform the CKP system variation learn procedure. Refer to «Crankshaft Position System Variation Learn»(/chevrolet/avalanche/ii-2006-2013/remont/testing-diagnostics/#engine-control-system-fuel-48l-53l-60l-or-62l-introduction__crankshaft-position-system-variation-learn) .

Note. Clean the area around the camshaft position (CMP) sensor before removal in order to prevent debris from entering the engine.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disconnect the engine wiring harness electrical connector (1) from the CMP sensor wire harness.
3. Remove the 2 CMP sensor wire harness bolts (738).
4. Loosen the top CMP sensor wire harness bolt using a box wrench through the harmonic balancer opening. Loosen the bolt 2 turns.
5. Disconnect the CMP sensor wire harness electrical connectors from the CMP sensor and the CMP actuator magnet.
6. Remove the CMP sensor wire harness (737).
7. Remove the CMP sensor (703) and O-ring seal (704).

1. Inspect the CMP O-ring seal for cuts or damage. If the seal is not cut or damaged, it may be used again.
2. Lubricate the O-ring seal with clean engine oil.
3. Install the O-ring seal (704) onto the sensor.
4. Instal the CMP sensor (703) to the front cover.
5. Install the CMP sensor wire harness (737).
6. Connect the CMP sensor wire harness electrical connectors to the CMP sensor and the CMP actuator magnet.
7. Install the 2 CMP sensor wire harness bolts (738). Tighten: Tighten the bolts to 12 N.m (106 lb in).
8. Finger tighten the top CMP sensor wire harness bolt. Using a box wrench through an opening in the harmonic balancer, tighten the bolt an additional 1/4 turn (90 degrees).
9. Connect the engine wiring harness electrical connector (1) to the CMP sensor wire harness.
10. Lower the vehicle.

Note. Clean the area around the camshaft position (CMP) sensor before removal in order to prevent debris from entering the engine.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disconnect the engine wiring harness electrical connector (1) from the CMP sensor wire harness.
3. Remove the CMP sensor wire harness bolts (705, and 738).
4. Remove the CMP sensor wire harness (737).
5. Remove the CMP sensor (703) and O-ring seal (704).

1. Inspect the CMP O-ring seal for cuts or damage. If the seal is not cut or damaged, it may be used again.
2. Lubricate the O-ring seal with clean engine oil.
3. Install the O-ring seal (704) onto the sensor.
4. Instal the CMP sensor (703) to the front cover.
5. Install the CMP sensor wire harness (737).
6. Install the CMP sensor wire harness bolts (705, and 738). Tighten: Tighten the bolts to 12 N.m (106 lb in).
7. Connect the engine wiring harness electrical connector (1) to the CMP sensor wire harness.
8. Lower the vehicle.

1. Lift and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disconnect the engine wiring harness electrical connector (4) from knock sensor.
3. Remove the knock sensor bolt (739) and knock sensor (718).

1. Position the knock sensor (718) to the engine block and install the knock sensor bolt (739). Tighten the bolt to 25 N.m (18 lb ft)
2. Connect the engine wiring harness electrical connector (4) to knock sensor.

1. Lift and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/avalanche/ii-2006-2013/remont/hoistjack/#general-information) .
2. Disconnect the engine wiring harness electrical connector (2) from knock sensor.
3. Remove the knock sensor bolt (739) and knock sensor (718).

1. Position the knock sensor (718) to the engine block and install the knock sensor bolt (739). Tighten the bolt to 25 N.m (18 lb ft)
2. Connect the engine wiring harness electrical connector (2) to knock sensor.

Scheme 17

Scheme 18

1. Remove the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .
2. Remove the positive crankcase ventilation (PCV) line (1) from the air cleaner outlet duct.
3. Remove the radiator inlet hose clamp retainer from the outlet duct.
4. Remove the radiator vent inlet hose retainer from the outlet duct.
5. Loosen the air cleaner outlet duct clamp (1) at the mass air flow (MAF)/intake air temperature (IAT) sensor.
6. Loosen the air cleaner outlet duct clamp (2) at the throttle body.
7. Lift up the air cleaner outlet duct at the resonator tab in order to separate the resonator from the stud on the intake manifold.
8. Remove the air cleaner outlet duct from the throttle body and MAF/IAT sensor.

1. Install the air cleaner outlet duct to the throttle body and MAF/IAT sensor. Ensure that the resonator tab aligns with the stud on the intake manifold.
2. Push down on the air cleaner outlet duct resonator directly over the resonator tab in order to secure the resonator to the stud on the intake manifold.
3. Tighten the air cleaner outlet duct clamp (2) at the throttle body to 4 N.m(35 lb in).
4. Tighten the air cleaner outlet duct clamp (1) to 4 N.m(35 lb in) at the MAF/IAT sensor.
5. Install the radiator vent inlet hose retainer to the outlet duct.
6. Install the radiator inlet hose clamp retainer to the outlet duct.
7. Install the PCV line (1) to the air cleaner outlet duct.
8. Install the intake manifold sight shield. Refer to «Upper Intake Manifold Sight Shield Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/mechanical/#engine-mechanical-48l-53l-60l-or-62l-2-of-5) .

Engine Control Module Description

The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The engine control module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the ECM detects a malfunction, the ECM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM.

Malfunction Indicator Lamp (MIL) Operation

The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON

Scheme 19

Scheme 20

The MIL indicates that an emissions related fault has occurred and vehicle service is required.

The following is a list of the modes of operation for the MIL

1. The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate.
2. The MIL turns OFF after the engine is started if a diagnostic fault is not present.
3. The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
4. The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
5. When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
6. When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.

Scheme 21

To provide maximum fuel economy under light load driving conditions, the engine control module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders 1, 7, 6, and 4, switching to a V4 mode. The engine will operate on 8 cylinders, or V8 mode, during engine starting, engine idling, and medium to heavy throttle applications.

When cylinder deactivation is commanded, the ECM will determine what cylinder is firing and begin deactivation on the next closest deactivated cylinder in firing order sequence. For example, if cylinder number 1 is on its combustion event when cylinder deactivation is commanded ON, the next cylinder in the firing order sequence that can be deactivated is cylinder number 7. If cylinder number 5 is on its combustion event when cylinder deactivation is commanded ON, then the next cylinder in the firing order sequence that can be deactivated is cylinder number 4.

Cylinder deactivation is accomplished by not allowing the intake and exhaust valves to open on the selected cylinders by using special valve lifters. The deactivation lifters contain spring loaded locking pins that connect the internal pin housing of the lifter to the outer housing.

The pin housing contains the lifter plunger and pushrod seat which interfaces with the pushrod. The outer housing contacts the camshaft lobe through a roller. During V8 mode, when all cylinders are active, the locking pins are pushed outward by spring force, locking the pin housing and outer housing together causing the lifter to function as a normal lifter. When cylinder deactivation is commanded ON, the locking pins are pushed inward with engine oil pressure directed from the valve lifter oil manifold (VLOM) assembly solenoids. When the lifter pin housing is unlocked from the outer housing, the pin housing will remain stationary, while the outer housing will move with the profile of the camshaft lobe, which results in the valve remaining closed. One VLOM solenoid controls both the intake and exhaust valves for each deactivating cylinder. There are 2 distinct oil passages going to each cylinder deactivation lifter bore, one for the hydraulic lash-adjusting feature of the lifter, and one for controlling the locking pins used for cylinder deactivation.

Although both intake and exhaust valve lifters are controlled by the same solenoid in the VLOM, the intake and exhaust valves do not become deactivated at the same time. Cylinder deactivation is timed so that the cylinder is on an intake event. During an intake event, the intake cam lobe is pushing the valve lifter upwards to open the intake valve against the force of the valve spring. The force exerted by the valve spring is acting on the side of the lifter locking pins, preventing them from moving until the intake valve has closed. When the intake valve lifter reaches the base circle of the camshaft lobe, the valve spring force is reduced, allowing the locking pins to move, deactivating the intake valve. However, when cylinder deactivation is commanded ON, the exhaust valve for the deactivated cylinder is in the closed position, allowing the locking pins on the valve lifter to move immediately, and deactivate the exhaust valve.

By deactivating the exhaust valve first, this allows the capture of a burnt air/fuel charge, or exhaust gas charge, in the combustion chamber. The capture of exhaust gases in the combustion chamber will contribute to a reduction in oil consumption, noise and vibration levels, and exhaust emissions when operating in V4 mode cylinder deactivation mode.

During the transition from V8 to V4 mode, the fuel injectors will be turned OFF on the deactivated cylinders. To help prevent spark plug fouling, the ignition system secondary voltage or spark is still present across the spark plug electrodes on the deactivated cylinders. If all enabling conditions are met and maintained for cylinder deactivation operation, the ECM calibrations will limit cylinder deactivation to a cycle time of 10 minutes in V4 mode, then return to V8 mode for 1 minute.

Switching between V8 and V4 modes is accomplished in less than 250 milliseconds, making the transitions seamless and transparent to the vehicle operator. The 250 milliseconds includes the time for the ECM to sequence the transitions, the response time for the VLOM solenoids to energize, and the time for the valve lifters to deactivate, all within 2 revolutions of the engine crankshaft.

Valve Lifter Oil Manifold (VLOM) Assembly

The cylinder deactivation system uses an electro-hydraulic actuator device called the valve lifter oil manifold (VLOM) assembly. The VLOM is bolted to the top of the engine valley, below the intake manifold assembly. The VLOM consists of 4 electrically operated normally closed solenoids. Each solenoid controls the application of engine oil pressure to the intake and exhaust valve lifters on the cylinders selected to deactivate. Engine oil pressure is routed to the VLOM assembly from an internal oil passage on the rear of the cylinder block.

All 4 VLOM solenoids are connected in parallel to a fused ignition 1 voltage circuit, supplied by the powertrain relay. The ground or control circuit for each solenoid is connected to a low side driver internal to the engine control module (ECM).

When all enabling conditions are met for cylinder deactivation, the ECM will ground each solenoid control circuit in firing order sequence, allowing current to flow through the solenoid windings. With the coil windings energized, the solenoid valve opens, redirecting engine oil pressure through the VLOM into 8 separate vertical passages in the engine lifter valley. The 8 vertical passages, 2 per cylinder, are connected to the valve lifter bores of the cylinders to be deactivated. When vehicle-operating conditions require a return to V8 mode, the ECM will turn OFF the control circuit for the solenoids, allowing the solenoid valves to close. With the solenoid valves closed, engine oil pressure in the control ports is exhausted through the body of the solenoids into the engine block lifter valley. The housing of the VLOM incorporates several bleeds in the oil passages to purge any air trapped in the VLOM or engine block.

To help control contamination to the hydraulic circuits, a small replaceable oil screen is located in the VLOM oil inlet passage, below the oil pressure sensor. The oil pressure sensor is a 3-wire sensor which provides oil pressure information to the ECM.

During service, use extreme care in keeping the VLOM assembly free of any contamination or foreign material.

Cylinder deactivation may be inhibited for many reasons including the following

1. Engine coolant temperature out of range for cylinder activation
2. Engine vacuum out of range
3. Brake booster vacuum out of range
4. Transmission gear incorrect or shift in progress
5. Accelerator pedal out of range or rate of pedal application to fast
6. Engine oil pressure and temperature out of range
7. Engine speed of range
8. Vehicle speed out of range
9. Minimum time in V8 mode not met
10. Maximum V4 mode time exceeded
11. Decel fuel cutoff active
12. Reduced engine power active
13. Torque management active
14. Catalytic converter over temperature protection active
15. Piston protection active, knock detected
16. Cylinder deactivation solenoid driver circuit faults

Scheme 22

The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the driver's intent based on input from the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle actuator motor. The throttle blade is spring loaded in both directions, and the default position is slightly open.

Normal Mode

During the operation of the TAC system, several modes, or functions, are considered normal. The following modes may be entered during normal operations

1. Minimum pedal value-At key-up, the ECM updates the learned minimum pedal value.
2. Minimum throttle position values-At key-up, the ECM updates the learned minimum throttle position value. In order to learn the minimum throttle position value, the throttle blade is moved to the Closed position.
3. Ice break mode-If the throttle blade is not able to reach a predetermined minimum throttle position, the ice break mode is entered. During the ice break mode, the ECM commands the maximum pulse width several times to the throttle actuator motor in the closing direction.
4. Minimum pedal value-At key-up, the ECM updates the learned minimum pedal value.
5. Battery saver mode-After a predetermined time without engine RPM, the ECM commands the Battery Saver mode. During the Battery Saver mode, the TAC module removes the voltage from the motor control circuits, which removes the current draw used to maintain the idle position and allows the throttle to return to the spring loaded default position.

Reduced Engine Power Mode

When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions

1. Acceleration limiting-The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
2. Limited throttle mode-The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
3. Throttle default mode-The ECM will turn OFF the throttle actuator motor, and the throttle will return to the spring loaded default position.
4. Forced idle mode-The ECM will perform the following actions: Limit engine speed to idle positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF. Ignore the accelerator pedal input.
5. Engine shutdown mode-The ECM will disable fuel and de-energize the throttle actuator.

Camshaft Position (CMP) Actuator System

The camshaft (CMP) actuator system is an electro-hydraulic operated device used for a variety of engine performance and operational enhancements. These enhancements include lower emission output through exhaust gas dilution of the intake charge in the combustion chamber, a broader engine torque range, and improved fuel economy. The CMP actuator system accomplishes this by, changing the angle or timing of the camshaft, relative to the crankshaft position. The CMP actuator simply allows earlier or later intake and exhaust valve opening, during the four stroke engine cycle. The CMP actuator cannot vary the duration of valve opening, or the valve lift.

During engine OFF, engine idling conditions, and engine shutdown, the camshaft actuator is held in the park position. Internal to the CMP actuator assembly is a return spring and a locking pin. During non-phasing modes of the camshaft, the return spring rotates the camshaft back to the park position, and the locking pin retains the CMP actuator sprocket to the camshaft. For the Gen IV small block engines, the park position for the CMP actuator and camshaft is, 8.5 degrees before top dead center (BTDC), which is equal to 17 crankshaft degrees BTDC, to the next cylinder in firing order. The engine control module (ECM) can only command the CMP actuator to retard the valve timing from the park position, or advance the valve timing back to the park position. The total range of valve timing authority is 31 degrees of camshaft rotation, which is equal to 62 degrees of crankshaft rotation. The control range is from the park position of 8.5 degrees camshaft, or 17 degrees of crankshaft BTDC, to 22.5 degrees camshaft, or 45 degrees crankshaft, after top dead center (ATDC).

CMP Actuator System Operation

The camshaft position (CMP) actuator system is controlled by the engine control module (ECM). The ECM sends a pulse width modulated, 12-volt signal to the CMP actuator solenoid to control the amount of pressurized engine oil, into the CMP actuator. A low reference circuit, or ground wire between the CMP actuator solenoid and the ECM completes the electrical circuit. The frequency of the pulse width modulated signal is fixed at 150 Hz. To regulate the pressurized engine oil into the CMP actuator, the solenoid uses electromagnetic force on the solenoid pintle to pulse the oil control spool valve. The pressurized engine oil is sent to unseat the locking pin, and to the vane and rotor assembly of the CMP actuator, to either retard or advance the valve timing. The ECM will control the amount of ON time applied to the solenoid, through the 12-volt signal from the ECM.

The ECM uses the following inputs before assuming control of the CMP actuator, and to calculate the optimum valve timing.

1. Engine speed
2. Manifold absolute pressure (MAP)
3. Throttle position angle
4. Camshaft position sensor (CMP)
5. Crankshaft position sensor (CKP)
6. Crankshaft/camshaft correlation
7. Engine coolant temperature (ECT)
8. Closed loop fuel control
9. Engine oil pressure (EOP)
10. Engine oil level
11. CMP actuator solenoid circuit state

CMP Actuator Solenoid Circuit Diagnostics

The engine control module (ECM) monitors the control circuit of the camshaft position (CMP) actuator solenoid for electrical faults. The control module has the ability to determine if a control circuit is open, shorted high, or shorted low. If the control module detects a fault with the CMP actuator solenoid control circuit, DTC P0010 will set.

CMP Actuator System Performance Diagnostic

The engine control module (ECM) monitors the performance of the camshaft position (CMP) actuator system by monitoring the calibrated desired position, and the actual position of the camshaft, through the 4X signal of the CMP sensor. If the difference between the actual and desired position is greater than a calibrated angle, for more than a calibrated amount of time, DTC P0011 will set.

For the system descriptions covering the hydraulic/mechanical part of the CMP actuator refer to Camshaft Position Actuator and Solenoid Valve Description .

Fuel System Overview

The Fuel System is a returnless on-demand design. The fuel pressure regulator is a part of the fuel sender assembly, eliminating the need for a return pipe from the engine. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions.

An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times.

E85 Flex Fuel Description

E85 compatible vehicles no longer use an alcohol sensor to determine and adjust for the alcohol content of the fuel in the tank. Instead, the vehicle calculates the alcohol content of the fuel through measured adjustments.

The ethanol calculation occurs with the engine running after a refueling event has been detected via a measured change in the fuel level sender output. The virtual flex fuel sensor (V-FFS) algorithm temporarily closes the canister purge valve for a few seconds and monitors information from the closed loop fuel trim system to calculate the ethanol content. This logic executes several times until the ethanol calculation is deemed to be stable. This may take several minutes under low fuel flow conditions such as idle, or a shorter time during higher fuel flow, off-idle conditions.

Air-fuel ratios and the corresponding ethanol percentage are updated following each purge-off sequence. The fuel alcohol content percentage value can be read on a scan tool.

When an E85 compatible vehicle is built, an ECM or PCM replaced, or if the learned alcohol content has been reset with a scan tool the fuel system will need to contain ASTM gasoline with 10 percent or less ethanol content.

A minimum of 11 liters (3 gallons) must be put in the tank in order for the vehicle to recognize a re-fueling event. It is not necessary to turn the ignition OFF in order to have the re-fueling event recognized, however local safety regulations should be followed.

After the re-fueling event, the system registers the amount of fuel that was added, relative to the amount that was in the tank. Reading fuel trim and O2 sensor activity, the system determines if the fuel added was either ASTM Gasoline or ASTM E85. Based on that determination, the system adjusts to the expected alcohol mix in the fuel tank, and then the fuel trim and O2 sensor activity fine tunes the adjustments. The system must remain in closed loop in order for this adjustment to occur. Numerous short trips after switching from gasoline to E85, or E85 to gasoline, can result in driveability symptoms due to the inability of the system to adjust for fuel composition by not attaining closed loop operation.

Switching Between Gasoline and E85

No special precautions need to be taken when switching back and forth between gasoline and E85 other than re-fueling events must be 11 liters (3 gallons) or greater, and the vehicle must remain in closed loop long enough, usually by the time the engine has maintained full operating temperature, to calculate the composition of the new blend in the tank.

Fuel Pump Flow Control Module (FPCM)

The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a 25 KHZ PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal. Maximum current supplied to the fuel pump is 15 amps. A liquid fuel pressure sensor provides fuel pressure feedback to the FPCM.

Electronic Returnless Fuel System (ERFS)

The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of fuel pump flow control module (FPCM). Desired fuel pressure is commanded by the engine control module (ECM), and transmitted to the FPCM via a GMLAN serial data message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control.

Liquid Fuel Pressure Sensor - With FPCM

The fuel pressure sensor is a serviceable 5-volt, 3-pin device. It is located on the fuel feed line forward of the fuel tank, and receives power and ground from the fuel pump flow control module (FPCM) through a vehicle wiring harness. The sensor provides a fuel pressure signal to the FPCM, which is used to provide Closed Loop fuel pressure control.

Fuel Tanks

The fuel tanks store the fuel supply. The front fuel tank is located on the left side of the vehicle. On dual-tank applications, the secondary fuel tank is located in the rear of the vehicle above the spare tire. The fuel tanks are each held in place by 2 metal straps that attach to the frame. The fuel tanks are molded from high density polyethylene.

Scheme 23

The fuel fill pipe has a built-in restrictor in order to prevent refueling with leaded fuel. When refueling dual tank applications, fuel is dispensed to both the front and rear fuel tanks at the same time. Once the fill vent is obstructed, fuel backs up the fill pipe and trips the dispensing nozzle.

Scheme 24

The front fuel tank vent runs into the rear tank to the top of the filler pipe assembly, which in turn vents to atmosphere. The fuel tank vent valves are connected and route to the canister to collect hydrocarbon emissions during operation of the vehicle.

Scheme 25

The fuel fill pipe has a tethered fuel filler cap. A torque-limiting device prevents the cap from being over tightened. To install the cap, turn the cap clockwise until you hear clicks. This indicates that the cap is correctly torqued and fully seated. A built-in device indicates that the fuel filler cap is fully seated. A fuel filler cap that is not fully seated may cause a malfunction in the emission system.

Scheme 26

The front fuel sender on dual tank applications consists of the following major components

1. The fuel level sensor
2. The fuel tank fuel pump module
3. The fuel strainer
4. The fuel filter

Scheme 27

The rear fuel sender on dual tank applications consists of the following major components

1. The fuel level sensor (4)
2. The FTP sensor (1)
3. The rear fuel pump (2)

The fuel sender assembly on single tank applications consists of the following major components

1. The fuel level sensor
2. The fuel tank pressure (FTP) sensor
3. The fuel tank fuel pump module
4. The fuel strainer
5. The fuel filter

Fuel Level Sensor

The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank. The engine control module (ECM) sends the fuel level information via the class 2 circuit to the instrument panel (I/P) cluster. This information is used for the I/P fuel gage and the low fuel warning indicator, if applicable. The ECM also monitors the fuel level input for various diagnostics.

Fuel Pump

The fuel pump is mounted in the fuel sender assembly reservoir. The fuel pump is an electric high pressure pump. Fuel is pumped to the fuel rail at a specified flow and pressure. The fuel pump delivers a constant flow of fuel to the engine during low fuel conditions and aggressive vehicle maneuvers. The engine control module (ECM) controls the electric fuel pump operation through a fuel pump relay. The fuel pump flex pipe acts to dampen the fuel pulses and noise generated by the fuel pump.

Fuel Strainer

The fuel strainer attaches to the lower end of the fuel sender. The fuel strainer is made of woven plastic. The functions of the fuel strainer are to filter contaminants and to wick fuel. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment.

Fuel Filter

The fuel filter is contained in the fuel sender assembly inside the fuel tank. The paper filter element of the fuel filter traps particles in the fuel that may damage the fuel injection system. The fuel filter housing is made to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. There is no service interval for fuel filter replacement.

Nylon Fuel Pipes

Nylon pipes are constructed to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. There are 3 sizes of nylon pipes used: 9.5 mm (3/8 in) ID for the fuel supply, 7.6 mm (5/16 in) ID for the fuel return, and 12.7 mm (1/2 in) ID for the vent. Heat resistant rubber hose or corrugated plastic conduit protects the sections of the pipes that are exposed to chafing, to high temperatures, or to vibration.

Nylon fuel pipes are somewhat flexible and can be formed around gradual turns under the vehicle. However, if nylon fuel pipes are forced into sharp bends, the pipes kink and restrict the fuel flow. Also, once exposed to fuel, nylon pipes may become stiffer and are more likely to kink if bent too far. Take special care when working on a vehicle with nylon fuel pipes.

Quick-Connect Fittings

Quick-connect fittings provide a simplified means of installing and connecting fuel system components. The fittings consist of a unique female connector and a compatible male pipe end. O-rings, located inside the female connector, provide the fuel seal. Integral locking tabs inside the female connector hold the fittings together.

On-Board Refueling Vapor Recovery System (ORVR)

The On-Board Refueling Vapor Recovery System (ORVR) is an on-board vehicle system designed to recover fuel vapors during the vehicle refueling operation. The flow of liquid fuel down the fuel filler pipe provides a liquid seal which prevents vapor from leaving the fuel filler pipe. An evaporative emission (EVAP) pipe transports the fuel vapor to the EVAP canister for use by the engine.

Fuel Pipe O-Rings

O-rings seal the threaded connections in the fuel system. Fuel system O-ring seals are made of special material. Service the O-ring seals with the correct service part.

Scheme 28

The fuel rail assembly attaches to the engine intake manifold. The fuel rail assembly performs the following functions

1. Positions the injectors (3) in the intake manifold
2. Distributes fuel evenly to the injectors (2)
3. Fuel rail feed pipe (1)

Fuel Injectors

The fuel injector assembly is a solenoid device controlled by the engine control module (ECM) that meters pressurized fuel to a single engine cylinder. The ECM energizes the injector solenoid to open a normally closed ball valve. This allows the fuel to flow into the top of the injector, past the ball valve, and through a director plate at the injector outlet. The director plate has machined holes that control the fuel flow, generating a spray of finely atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve, causing the fuel to become further atomized and vaporized before entering the combustion chamber. This fine atomization improves fuel economy and emissions.

Fuel Pressure Regulator

The fuel pressure regulator is contained in the fuel sender assembly.

Fuel Metering Modes of Operation

The engine control module (ECM) monitors voltages from several sensors in order to determine how much fuel to give the engine. The ECM controls the amount of fuel delivered to the engine by changing the fuel injector pulse width. The fuel is delivered under one of several modes.

Starting Mode

When the ignition is first turned ON, the ECM energizes the fuel pump relay for 2 seconds. This allows the fuel pump to build pressure in the fuel system. The ECM calculates the air/fuel ratio based on inputs from the engine coolant temperature (ECT), mass air flow (MAF), manifold absolute pressure (MAP), and throttle position (TP) sensors. The system stays in starting mode until the engine speed reaches a predetermined RPM.

Clear Flood Mode

If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the TP sensor is at wide open throttle (WOT), the ECM reduces the fuel injector pulse width in order to increase the air to fuel ratio. The ECM holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the ECM returns to the starting mode.

Run Mode

The run mode has 2 conditions called Open Loop and Closed Loop. When the engine is first started and the engine speed is above a predetermined RPM, the system begins Open Loop operation. The ECM ignores the signal from the heated oxygen sensors (HO2S). The ECM calculates the air/fuel ratio based on inputs from the ECT, MAF, MAP, and TP sensors. The system stays in Open Loop until meeting the following conditions

1. Both front HO2S have varying voltage output, showing that both HO2S are hot enough to operate properly.
2. The ECT sensor is above a specified temperature.
3. A specific amount of time has elapsed after starting the engine.

Specific values for the above conditions exist for each different engine, and are stored in the electrically erasable programmable read-only memory (EEPROM). The system begins Closed Loop operation after reaching these values. In Closed Loop, the ECM calculates the air/fuel ratio, injector ON time, based upon the signal from various sensors, but mainly from the HO2S. This allows the air/fuel ratio to stay very close to 14.7:1.

Acceleration Mode

When the driver pushes on the accelerator pedal, air flow into the cylinders increases rapidly. To prevent possible hesitation, the ECM increases the pulse width to the injectors to provide extra fuel during acceleration. This is also known as power enrichment. The ECM determines the amount of fuel required based upon the TP, the ECT, the MAP, the MAF, and the engine speed.

Deceleration Mode

When the driver releases the accelerator pedal, air flow into the engine is reduced. The ECM monitors the corresponding changes in the TP, the MAP, and the MAF. The ECM shuts OFF fuel completely if the deceleration is very rapid, or for long periods, such as long, closed-throttle coast-down. The fuel shuts OFF in order to prevent damage to the catalytic converters.

Battery Voltage Correction Mode

When the battery voltage is low, the ECM compensates for the weak spark delivered by the ignition system in the following ways

1. Increasing the amount of fuel delivered
2. Increasing the idle RPM
3. Increasing the ignition dwell time

Fuel Cutoff Mode

The ECM cuts OFF fuel from the fuel injectors when the following conditions are met in order to protect the powertrain from damage and improve driveability

1. The ignition is OFF. This prevents engine run-on.
2. The ignition is ON but there is no ignition reference signal. This prevents flooding or backfiring.
3. The engine speed is too high, above red line.
4. The vehicle speed is too high, above rated tire speed.
5. During an extended, high speed, closed throttle coast down-This reduces emissions and increases engine braking.
6. During extended deceleration, in order to prevent damage to the catalytic converters

Fuel Trim

The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The ECM monitors the heated oxygen sensor (HO2S) signal voltage while in Closed Loop and regulates the fuel delivery by adjusting the pulse width of the fuel injectors based on this signal. The ideal fuel trim values are around 0 percent for both short term and long term fuel trim. A positive fuel trim value indicates the ECM is adding fuel in order to compensate for a lean condition by increasing the pulse width. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition by decreasing the pulse width. A change made to the fuel delivery changes the short term and long term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltage. These changes fine tune the engine fueling. The long term fuel trim makes coarse adjustments to the fueling in order to re-center and restore control to short term fuel trim. A scan tool can be used to monitor the short term and long term fuel trim values. The long term fuel trim diagnostic is based on an average of several of the long term speed load learn cells. The ECM selects the cells based on the engine speed and engine load. If the ECM detects an excessive lean or rich condition, the ECM will set a fuel trim diagnostic trouble code (DTC).

EVAP System Operation

The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.

Large Leak Test

This tests for large leaks and restrictions to the purge path in the evaporative emission (EVAP) system. When the enabling criteria has been met, the control module commands the EVAP vent solenoid valve ON and the EVAP purge solenoid valve ON, allowing vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.

Small Leak Test

The engine off natural vacuum (EONV) diagnostic is the small-leak detection diagnostic for the evaporative emission (EVAP) system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the ignition OFF. Because of this, it may be normal for the control module to remain active for up to 40 minutes after the ignition is turned OFF. This is important to remember when performing a parasitic draw test on vehicles equipped with EONV.

The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. The EONV diagnostic relies on this temperature change and the corresponding pressure change in a sealed system, to determine if an EVAP system leak is present.

The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, often little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.

Canister Vent Restriction Test

If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge solenoid valve ON, commanding the EVAP vent solenoid valve OFF, and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will set.

Purge Solenoid Valve Leak Test

If the evaporative emission (EVAP) purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON, sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that the EVAP system vacuum increases above a calibrated value, DTC P0496 will set.

Check Gas Cap Message

The control module sends a class 2 message to the driver information center (DIC) illuminating the Check Gas Cap message when a malfunction in the evaporative emission (EVAP) system and a large leak test fails.

EVAP System Components

The evaporative emission (EVAP) system consists of the following components

EVAP Canister

The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.

EVAP Purge Solenoid Valve

The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.

EVAP Vent Solenoid Valve

The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks.

Fuel Tank Pressure Sensor

The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure.

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Electronic Ignition (EI) System Operation

The electronic ignition (EI) system produces and controls the high energy secondary spark. This spark ignites the compressed air/fuel mixture at precisely the correct time, providing optimal performance, fuel economy, and control of exhaust emissions. The engine control module (ECM) primarily collects information from the crankshaft position (CKP) and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark.

Crankshaft Position (CKP) Sensor

The crankshaft position (CKP) sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of the reluctor wheel on the crankshaft. The reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The reference gap is used to identify the crankshaft position at each start-up. The CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The CKP sensor sends a digital signal to the ECM as each tooth on the reluctor wheel rotates past the CKP sensor. The ECM uses each CKP signal pulse to determine crankshaft speed position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CKP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.

Camshaft Position (CMP) Sensor

The sensor detects magnetic flux changes between the four narrow and wide tooth slots on the reluctor wheel. The CMP sensor provides a digital ON/OFF DC voltage of varying frequency per each camshaft revolution. The ECM will recognize the narrow and wide tooth patterns to identify camshaft position, or which cylinder is in compression and which is in exhaust. The information is then used to determine the correct time and sequence for fuel injection and ignition spark events.

Knock Sensor (KS)

The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation, also known as spark knock. The KS system uses one or 2 flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The amplitude and frequency are dependant upon the level of knock that the KS detects. The control module receives the KS signal through the signal circuit. The KS ground is supplied by the control module through the low reference circuit.

The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal KS signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If knock is present, the signal will range outside of the noise channel.

If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will stay outside of the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise.

Ignition Coils

Each ignition coil has an ignition 1 voltage feed and a ground circuit. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, which allows the current to flow through the primary coil windings. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes.

Engine Misfire Detection

The CKP sensor is used to determine when an engine misfire is occurring. The CMP sensor is used to determine which cylinder is misfiring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. For accurate detection of engine misfire, the ECM must distinguish between crankshaft deceleration caused by actual misfire and deceleration caused by rough road conditions. The antilock brake system (ABS) can detect if the vehicle is on a rough road based on wheel acceleration/deceleration data supplied by the wheel speed sensors. If the ABS detects rough road above a predetermined threshold, this information is sent to the ECM. The ECM uses the rough road information when calculating engine misfire. Under certain driving conditions, a misfire rate can be high enough to cause the 3-way catalytic converter (TWC) to overheat damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF when converter overheating, damaging conditions are present.

Illustration Tool Number/Description GE 41415-50 Fuel Tank Cap Adapter J 23738-A Mityvac J 26792 HEI Spark Tester J 34730-1A Fuel Pressure Gage CH 47976 Active Fuel Injector Tester CH-48027 Digital Pressure Gauge CH-47976 Active Fuel Injector Tester (AFIT) J 34730-405 Injector Test Lamp J 35616-A GM-Approved Terminal Test Kit J 35800 Fuel Injector Cleaner J 37287 Fuel Line Shutoff Adapters J 37287-FF Fuel Line Shutoff Adapters J 38522 Variable Signal Generator J 39021 Fuel Injector Coil and Balance Tester J 39021-380 Injector Tester Adapter J 41413-200 Evaporative Emissions System Tester (EEST) CH-48096 EVAP Service Access Port Tool J 41413-VLV EVAP Service Port Vent Fitting J 41413-SPT High Intensity White Light J 41415-40 Fuel Tank Cap Adapter J 41416 Ultrasonic Leak Detector J 41769 Fuel Line Disconnect Tool Set J 42873-1 3/8 Fuel Line Shutoff Valve J 42873-2 5/16 Return Pipe Shutoff Valve J 42964-1 3/8 Fuel Pipe Shutoff Valve J 42964-2 5/16 Fuel Pipe Shutoff Valve J 43178 Fuel Line Disconnect Tool J 43244 Relay Puller Pliers J 44402 Fuel Tank Sending Unit Wrench J 44175 Fuel Composition Tester J 45004 Fuel Tank Drain Hose J 45722 Fuel Sender Lock Ring Wrench

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See also:
• Diagnostic System Check - Vehicle (with HP2)
• Diagnostic System Check - Vehicle (without HP2)
• DTC P0010
• DTC P0230 (w/LY6)
• DTC P069E
• Battery Negative Cable Disconnection and Connection
• Control Module References
• Diagnostic Trouble Code (DTC) List - Vehicle
• Cooling System Draining and Filling (Static Fill)
• Fastener Caution
• Upper Intake Manifold Sight Shield Replacement
• Lifting and Jacking the Vehicle
• Front Propeller Shaft Replacement
• Excessive Force and Oxygen Sensor Caution
• Component Fastener Tightening Caution
• Heated Oxygen and Oxygen Sensor Caution
• Front Wheelhouse Liner Replacement - Right Side
• Knee Bolster Replacement (Except Cadillac)
• Gasoline/Gasoline Vapors Warning
• Electrical Center Identification Views
• Safety Glasses Warning
• Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution
• Relieving Fuel Pressure Warning
• Fuel Pipe Fitting Warning
• Damage to Fuel Tank Straps Caution
• Rear Bumper Step Outer Pad Replacement (Avalanche, Cadillac EXT)
• Camshaft Position Actuator and Solenoid Valve Description
• Fuel and Evaporative Emission Pipe Warning
• Air Cleaner Resonator Outlet Duct Replacement
• Throttle Learn
• Fuel Pressure Relief (Without CH-48027)
• Fuel Tank Draining (Single Tank)
• Ignition System Specifications
• Crankshaft Position System Variation Learn