Fuel Supply System Acura TL III

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2004-2005 models

If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is on, you will hear some noise if you listen to the fuel fill port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is first turned on. If the fuel pump does not make noise, check as follows

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1. Turn the ignition switch OFF.
2. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), then remove PGM-FI main relay 2 (FUEL PUMP) (A) from the under-dash fuse/relay box.
3. Turn the ignition switch ON (II).
4. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 5 . NO Replace PGM-FI main relay 1 (FI MAIN). If needed replace the under-dash fuse/relay box.
5. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 6 . NO Check the No. 19 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box. If needed replace the under-dash fuse/relay box.
6. Turn the ignition switch OFF.
7. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 4 to body ground with a jumper wire.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/PCM connector A (31P).
10. Check for continuity between body ground and ECM/PCM connector terminal A2. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the ECM/PCM (A2).
11. Reinstall PGM-FI main relay 2 (FUEL PUMP).
12. Connect ECM/PCM connector terminal A5 to body ground with jumper wire.
13. Turn the ignition switch ON (II).
14. Measure voltage between ECM/PCM connector terminal A2 and body ground. Is there battery voltage? YES - Go to step 15 . NO - Replace PGM-FI main relay 2 (FUEL PUMP).
15. Turn the ignition switch OFF.
16. Reconnect ECM/PCM connector A (31P).
17. Open the SCS line with the HDS.
18. Turn the ignition switch OFF.
19. Turn the ignition switch ON (II), and measure voltage between ECM/PCM connector terminal A2 and body ground within 2 seconds. Is there battery voltage? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Go to step 20 .
20. Turn the ignition switch OFF.
21. Remove the trunk floor trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ).
22. Remove the access panel from the floor.
23. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds. Is there battery voltage? YES - Go to step 28 . NO - Go to step 24 .
24. Turn the ignition switch OFF.
25. Remove PGM-FI main relay 2 (FUEL PUMP).
26. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminals No. 1 and No. 2 with a jumper wire.
27. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds. Is there battery voltage? YES - Replace PGM-FI main relay 2 (FUEL PUMP). NO - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the fuel pump 5P connector.
28. Turn the ignition switch OFF.
29. Check for continuity between fuel pump 5P connector terminal No. 4 and body ground. Is there continuity? YES - Replace the fuel pump. NO - Repair open in the wire between the fuel pump 5P connector and G603.

2006 Model

If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is on, you will hear some noise if you listen to the fuel fill port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is first turned on. If the fuel pump does not make noise, check as follows

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1. Turn the ignition switch OFF.
2. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), then remove PGM-FI main relay 2 (FUEL PUMP) (A) from the under-dash fuse/relay box.
3. Turn the ignition switch ON (II).
4. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 5 . NO- Replace PGM-FI main relay 1 (FI MAIN) If needed replace the under-dash fuse/relay box.
5. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 6 . NO- Check the No. 19 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box. If needed replace the under-dash fuse/relay box.
6. Turn the ignition switch OFF.
7. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 4 to body ground with a jumper wire.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/PCM connector E (31P).
10. Check for continuity between body ground and ECM/PCM connector terminal E2. Is there continuity? YES - Go to step 11 . NO - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the ECM/PCM (E2).
11. Reinstall PGM-FI main relay 2 (FUEL PUMP).
12. Connect ECM/PCM connector terminal E5 to body ground with jumper wire.
13. Turn the ignition switch ON (II).
14. Measure voltage between ECM/PCM connector terminal E2 and body ground. Is there battery voltage? YES - Go to step 15 . NO - Replace PGM-FI main relay 2 (FUEL PUMP).
15. Turn the ignition switch OFF.
16. Reconnect ECM/PCM connector E (31P).
17. Open the SCS line with the HDS.
18. Turn the ignition switch OFF.
19. Turn the ignition switch ON (II), and measure voltage between ECM/PCM connector terminal E2 and body ground within 2 seconds. Is there battery voltage? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ). NO - Go to step 20 .
20. Turn the ignition switch OFF.
21. Remove the trunk floor trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ).
22. Remove the access panel from the floor.
23. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds. Is there battery voltage? YES - Go to step 28 . NO - Go to step 24 .
24. Turn the ignition switch OFF.
25. Remove PGM-FI main relay 2 (FUEL PUMP).
26. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminals No. 1 and No. 2 with a jumper wire.
27. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds. Is there battery voltage? YES - Replace PGM-FI main relay 2 (FUEL PUMP). NO - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the fuel pump 5P connector.
28. Turn the ignition switch OFF.
29. Check for continuity between fuel pump 5P connector terminal No. 4 and body ground. Is there continuity? YES - Replace the fuel pump. NO - Repair open in the wire between the fuel pump 5P connector and G603.

Fuel Pressure Relieving

Before disconnecting fuel lines or hoses, relieve pressure from the system by stopping the fuel pump and then disconnecting the fuel tube/quick connect fitting in the engine compartment.

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1. Make sure you have the anti-theft codes for the radio and the navigation system (if equipped) then write down the audio presets.
2. Remove the fuel fill cap, and relieve the pressure in the fuel tank.
3. Turn the ignition switch ON (II).
4. From the INSPECTION MENU of the HDS, select Fuel Pump OFF, then start the engine, and let it idle until it stalls.
5. Turn the ignition switch OFF. NOTE: Do not allow the engine to idle above 1,000 rpm or the ECM/PCM will continue to operate the fuel pump. A DTC or a Temporary DTC may be set during this procedure. Check for DTCs, and clear them as needed (see «HDS CLEAR COMMAND»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).
6. Turn the ignition switch OFF.
7. Disconnect the negative cable from the battery.
8. Remove the quick-connect fitting cover (A).
9. Check the fuel quick-connect fitting for dirt, and clean it if needed.
10. Place a rag or shop towel over the quick-connect fitting (A).
11. Disconnect the quick-connect fitting (A): Hold the connector (B) with one hand, and squeeze the retainer tabs (C) with the other hand to release them from the locking tabs (D). Pull the connector off. NOTE: To prevent the remaining fuel in the fuel feed line or hose from flowing out, use a rag or shop towel. Be careful not to damage the line (E) or other parts. Do not use tools. If the connector does not move, keep the retainer tabs pressed down, and alternately pull and push the connector until it comes off easily. Do not remove the retainer from the line; once removed, the retainer must be replaced with a new one.
12. After disconnecting the quick-connect fitting, check it for dirt or damage (see step 4 ).
13. Reconnect the negative cable to the battery, then do this: Do the power window control unit reset procedure (see «RESETTING THE POWER WINDOW CONTROL UNIT»(/acura/tl/iii-2003-2006/remont/windows/#power-window-system__resetting-the-power-window-control-unit) ). Enter the anti-theft codes for the radio and the navigation system, then enter the customer's radio station and XM radio channel presets. Set the clock.

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1. Make sure you have the anti-theft codes for the radio and the navigation system (if equipped) then write down the customer's radio station and XM radio channel presets.
2. Remove the left kick panel (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ), then remove PGM-FI main relay 2 (FUEL PUMP) (A) from the under-dash fuse/relay box.
3. Start the engine, and let it idle until it stalls. NOTE: If any DTCs are stored, clear and ignore them.
4. Turn the ignition switch OFF.
5. Remove the fuel fill cap, and relieve the pressure in the fuel tank.
6. Disconnect the negative cable from the battery.
7. Remove the quick-connect fitting cover (A).
8. Check the fuel quick-connect fitting for dirt, and clean it if needed.
9. Place a rag or shop towel over the quick-connect fitting (A).
10. Disconnect the quick-connect fitting (A): Hold the connector (B) with one hand, and squeeze the retainer tabs (C) with the other hand to release them from the locking tabs (D). Pull the connector off. NOTE: To prevent the remaining fuel in the fuel feed line or hose from flowing out, use a rag or shop towel. Be careful not to damage the line (E) or other parts. Do not use tools. If the connector does not move, keep the retainer tabs pressed down, and alternately pull and push the connector until it comes off easily. Do not remove the retainer from the line; once removed, the retainer must be replaced with a new one.
11. After disconnecting the quick-connect fitting, check it for dirt or damage (see step 4 ).
12. Reconnect the negative cable to the battery and do the following items: Do the power window control unit reset procedure (see «RESETTING THE POWER WINDOW CONTROL UNIT»(/acura/tl/iii-2003-2006/remont/windows/#power-window-system__resetting-the-power-window-control-unit) ). Enter the anti-theft codes for the radio and the navigation system, then enter the customer's XM radio channel presets. Set the clock.

Fuel Pressure Test

Special Tools Required

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1. Fuel pressure gauge 07406-004000B
2. Fuel pressure gauge attachment set 07AAJ-S6MA150 Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ). Disconnect the quick-connect fitting. Attach the fuel pressure gauge set and the fuel pressure gauge. Start the engine and let it idle. If the engine starts, go to step 5 . If the engine does not start, go to step 4 . Check to see if the fuel pump is running: listen to the fuel filler port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is first turned on. If the pump runs, go to step 5 . If the pump does not run, do the fuel pump circuit troubleshooting. 2004-2005 models (see «2004-2005 MODELS»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__2004-2005-models) ) 2006 model (see «2006 MODEL»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__2006-model) ) Read the fuel pressure gauge. The pressure should be 392-441 kPa (4.0-4.5 kgf/cm 2 , 57-64 psi). If the pressure is OK, the test is complete. If the pressure is out of specification, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system) ) and the fuel filter (see «FUEL FILTER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-filter-replacement) ), then recheck the fuel pressure.

Fuel Tank Draining

1. Remove the fuel tank unit (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ).
2. Using a hand pump, a hose, and a container suitable for fuel, draw the fuel from the fuel tank.
3. Install the fuel tank unit (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ).

Fuel Line Inspection

Check the fuel system lines and hoses, for damage, leaks, and deterioration. Replace any damaged parts.

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Check all clamps and retighten if necessary.

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Fuel Line/Quick-Connect Fitting Precautions

The fuel line/quick-connect fittings connect the fuel rail (A) to the fuel feed hose (B), fuel feed hose (B) to the fuel feed hose (C), the fuel feed hose (C) to the fuel line (D), the fuel line (E) to the fuel tank unit (F) and the fuel vapor line (G) to the EVAP canister (H). When removing or installing the fuel feed hose, the fuel tank unit, or the fuel tank, it is necessary to disconnect or connect the quick-connect fittings.

Pay attention to the following

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1. The fuel feed hoses, fuel line, and quick-connect fittings are not heat-resistant; be careful not to damage them during welding or other heat-generating procedures.
2. The fuel feed hoses, fuel line, and quick-connect fittings are not acid-proof; do not touch them with a shop towel that was used for wiping battery electrolyte. Replace them if they came into contact with electrolyte or something similar.
3. When connecting or disconnecting the fuel feed hoses, fuel line, and quick-connect fittings, be careful not to bend or twist them excessively. Replace them if they are damaged.

A disconnected quick-connect fitting can be reconnected, but the retainer on the mating line cannot be reused once it has been removed from the line. Replace the retainer when

1. Replacing the fuel rail.
2. Replacing the fuel line.
3. Replacing the fuel pump.
4. Replacing the fuel filter.
5. Replacing the fuel gauge sending unit.
6. It has been removed from the line.
7. It is damaged.

DIAMETER THICKNESS SPECIFICATION

Fuel Line/Quick-Connect Fitting Removal

Note. Before you work on the fuel lines and fittings, read the FUEL LINE/QUICK-CONNECT FITTING PRECAUTIONS .

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1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Check the fuel quick-connect fittings (A) for dirt, and clean it if needed.
3. Place a rag or shop towel over the quick-connect fitting. Hold the connector (A) with one hand, and squeeze the retainer tabs (B) with the other hand to release them from the locking tabs (C). Pull the connector off. NOTE: Be careful not to damage the line (D) or other parts. Do not use tools. If the connector does not move, keep the retainer tabs pressed down, and alternately pull and push the connector until it comes off easily. Do not remove the retainer from the line; once removed, the retainer must be replaced with a new one.
4. Check the contact area (A) of the line (B) for dirt or damage. If it is dirty, clean it. If it is rusty or damaged, replace the fuel pump, fuel filter, or fuel feed line.
5. To prevent damage and keep foreign matter out, cover the disconnected connector and line ends with plastic bags (A). NOTE: The retainer cannot be reused once it has been removed from the line. Replace the retainer when: Replacing the fuel rail. Replacing the fuel feed line. Replacing the fuel pump. Replacing the fuel filter. Replacing the fuel gauge sending unit. Replacing the EVAP canister. Replacing the fuel vapor line. It has been removed from the line. It is damaged.

Fuel Line/Quick-Connect Fitting Installation

Note. Before you work on the fuel lines and fittings, read the FUEL LINE/QUICK-CONNECT FITTING PRECAUTIONS .

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1. Check the contact area (A) of the line (B) for dirt or damage, and clean it if needed.
2. Insert a new retainer (A) into the connector (B) if the retainer is damaged, or after: Replacing the fuel rail. Replacing the fuel feed line. Replacing the fuel pump. Replacing the fuel filter. Replacing the fuel gauge sending unit. Replacing the EVAP canister. Replacing the fuel vapor line. Removing the retainer from the line. Use the same manufacturer retainer and the same size retainer when the replacing the retainer (see «FUEL LINE/QUICK-CONNECT FITTING PRECAUTIONS»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-precautions) ).
3. Before connecting a new fuel tube/quick-connect fitting assembly (A), remove the old retainer from the mating line.
4. Align the quick-connect fittings with the line (A), and align the retainer locking tabs (B) with the connector grooves (C). Then press the quick-connect fittings onto the line until both retainer pawls lock with a clicking sound. NOTE: If it is hard to connect, put a small amount of new engine oil on the line end.
5. When you are reconnecting the connector with the old retainer, make sure the connection is secure and the tabs (A) are firmly locked into place; check visually and also by pulling the connector (B). When you are replacing the fuel line with a new one, make sure you remove the ring pull (C) upwards after you confirm the connection is secure. NOTE: Before you remove the ring pull, make sure the fuel line connection is secure. If the connection is not secure, the ring pull could break when you try to remove it.
6. Reconnect the negative cable to the battery, and turn the ignition switch ON (II) (but do not operate the starter motor). The fuel pump will run for about 2 seconds, and fuel pressure will rise. Repeat two or three times, and check that there is no leakage in the fuel supply system.

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1. Remove the fuel tank unit (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ).
2. Remove the clip (A).
3. Remove the fuel pressure regulator (B).
4. Install the regulator in the reverse order of removal with new O-rings (C) lubricated with clean engine oil. Make sure the regulator is installed with the drain hole (D) facing down.

Fuel Filter Replacement

The fuel filter should be replaced whenever the fuel pressure drops below the specified value (see FUEL PRESSURE TEST ), after making sure that the fuel pump and the fuel pressure regulator are OK.

Scheme 51

1. Remove the fuel tank unit (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ).
2. Remove the fuel filter set (A).
3. Check these items before installing the fuel tank unit: When connecting the wire harness, make sure the connection is secure and the connectors (B) are firmly locked into place. When installing the fuel gauge sending unit (C), make sure the connection is secure and the connector (B) is firmly locked into place. Be careful not to bend or twist it excessively.
4. Install the parts in the reverse order of removal with a new locknut (D) a new base gasket (E), and new O-rings (F). When installing the fuel tank unit, align the marks on the unit and the fuel tank (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ).

Fuel Pump/Fuel Gauge Sending Unit Replacement

Special Tools Required

Fuel sender wrench 07AAA-S0XA100

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1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Remove the fuel fill cap.
3. Remove the trunk floor.
4. Remove the access panel (A) from the floor.
5. Disconnect the fuel pump 5P connector (B).
6. Disconnect the quick-connect fitting (C) from the fuel tank unit.
7. Using the special tool, loosen the locknut (A).
8. Remove the locknut (A) and the fuel tank unit.
9. Remove the fuel filter (B), the fuel gauge sending unit (C), the case (D), the wire harness (E), and the fuel pressure regulator (F).
10. When connecting the fuel pump assembly, make sure the connection is secure and the suction filter (G) is firmly connected to the fuel pump (H).
11. Check these items before installing the fuel tank unit: When connecting the wire harness, make sure the connection is secure and the connectors (I) are firmly locked into place. When installing the fuel gauge sending unit, make sure the connection is secure and the connector (I) is firmly locked into place. Be careful not to bend or twist it excessively.
12. Install the parts in the reverse order of removal with a new base gasket (J), new O-rings (K), and a new locknut (A). When installing the fuel tank unit, align the marks (L) on the unit (M) and the fuel tank (N). NOTE: After installation, make sure the base gasket is not pinched.

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1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Drain the fuel tank (see «FUEL TANK DRAINING»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-tank-draining) ).
3. Install the fuel tank unit.
4. Loosen the rear wheel nuts slightly, then raise the vehicle, and make sure it is securely supported. Remove the rear wheels.
5. Release the parking brake.
6. Remove the fuel tank covers (A).
7. Remove the exhaust muffler (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/exhaust/#intake-manifold-and-exhaust-system__exhaust-pipe-and-muffler-replacement) ).
8. Disconnect the fuel fill neck tube (A) and breather hose (B).
9. Disconnect the vapor line (A) from the EVAP canister (B). Then disconnect the fuel line (C).
10. Disconnect the wheel sensor 2P connector (A).
11. Remove the two flange bolts (A), and caliper body (B).
12. Remove the brake hose mounting bolt (A).
13. Hook the caliper body (A) on to the damper spring (B).
14. Remove the brake pads (see «REAR BRAKE PAD INSPECTION AND REPLACEMENT»(/acura/tl/iii-2003-2006/remont/mechanical-hydraulic/#conventional-brake-components__rear-brake-pad-inspection-and-replacement) ).
15. Remove the parking brake cable (see «PARKING BRAKE CABLE REPLACEMENT»(/acura/tl/iii-2003-2006/remont/mechanical-hydraulic/#conventional-brake-components) ).
16. Remove the flange bolt (A)
17. Remove the parking brake cable bracket bolt (A).
18. Remove the heat shield (A). Place a jack or support under the suspension subframe. Remove the mounting bolts (B). Remove the rear suspension subframe.
19. Remove the bolts (A) and the fuel tank straps (B).
20. Lift the fuel tank out of the subframe.

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1. Install the tank straps (A), and tighten the bolts (B).
2. Place a jack or support under the rear suspension subframe. Install the rear suspension subframe, aligning the pins (A) with the holes in the subframe.
3. Install the remaining parts in the reverse order of removal.
4. After installation, do a wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iii-2003-2006/remont/wheel-alignment/#front-suspension-and-rear-suspension__wheel-alignment) ).

Fuel Gauge Sending Unit Test

Note. For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram (see CIRCUIT DIAGRAM ).

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1. Check the No. 21 METER (7.5 A) fuse in the under-dash fuse/relay box before testing.
2. Do the B-CAN system diagnosis Test Mode A troubleshooting (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tl/iii-2003-2006/remont/communication-devices/#multiplex-intergrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). If no problem is found, go to step 3 . If DTC B1175 is indicated, go to the indicated DTC's troubleshooting.
3. Turn the ignition switch OFF.
4. Remove the trunk floor.
5. Remove the access panel (A) from the floor.
6. Disconnect the fuel pump 5P connector (B).
7. Measure voltage between fuel tank unit 5P connector terminals No. 1 and No. 2 with the ignition switch ON (II). There should be battery voltage. If the voltage is OK, go to step 8 . If the voltage is not as specified, check for: a short in the YEL/BLK wire to ground. an open in the YEL/BLK or BLK/WHT wire.
8. Turn the ignition switch OFF.
9. Remove the fuel tank unit from the fuel tank (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ).
10. Measure resistance between the No. 1 and No. 2 terminals with the float at E (EMPTY), 1/2 (HALF FULL), and F (FULL) positions. If you do not get the following readings, replace the fuel gauge sending unit (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-pumpfuel-gauge-sending-unit-replacement) ). FLOAT POSITION Float Position F 7.6 in. (191.4 mm) 1/2 4.4 in. (113.1 mm) LOW 2.0 in. (52.4 mm) E 0.8 in. (25.6 mm) Resistance ohms 19 to 21 205.5 to 215.5 487.9 to 644 770 to 790
11. Reconnect the fuel tank unit 5P connector.
12. Remove the No. 15 BACK UP (40 A) fuse from the under-hood fuse/relay box for at least 10 seconds, then reinstall it.
13. Turn the ignition switch ON (II).
14. Check that the pointer of the fuel gauge indicates "F" with the float at F. If the pointer of the fuel gauge does not indicate "F" replace the gauge assembly. If the gauge is OK, the test is complete. NOTE: The pointer of the fuel gauge returns to the bottom of the gauge dial when the ignition switch is OFF, regardless of the fuel level. Remove the No. 15 BACK UP (40 A) fuse from the under-hood fuse/relay box for at least 10 seconds after completing troubleshooting, otherwise it may take up to 20 minutes for the fuel gauge to indicate the correct fuel level.

Low Fuel Indicator Test

1. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). If the low fuel indicator flashes, go to step 2 . If the low fuel indicator does not flash, replace the gauge control module.
2. Do the B-CAN system diagnosis Test Mode A troubleshooting (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tl/iii-2003-2006/remont/communication-devices/#multiplex-intergrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). If any DTCs are indicated, do the indicated DTC's troubleshooting. If no DTCs are indicated, go to step 3.
3. Do the fuel gauge sending unit test (see «FUEL GAUGE SENDING UNIT TEST»(/acura/tl/iii-2003-2006/remont/fuel-system/#fuel-supply-system__fuel-gauge-sending-unit-test) ).

See also:
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM
• ECM/PCM REPLACEMENT
• TRIM REMOVAL/INSTALLATION - TRUNK AREA
• HDS CLEAR COMMAND
• RESETTING THE POWER WINDOW CONTROL UNIT
• EXHAUST PIPE AND MUFFLER REPLACEMENT
• REAR BRAKE PAD INSPECTION AND REPLACEMENT
• PARKING BRAKE CABLE REPLACEMENT
• WHEEL ALIGNMENT
• CIRCUIT DIAGRAM
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• SELF-DIAGNOSTIC FUNCTION
• FUEL PRESSURE RELIEVING
• 2004-2005 MODELS
• 2006 MODEL
• FUEL PRESSURE REGULATOR REPLACEMENT
• FUEL FILTER REPLACEMENT
• FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT
• FUEL LINE/QUICK-CONNECT FITTING PRECAUTIONS
• FUEL PRESSURE TEST
• FUEL TANK DRAINING
• FUEL GAUGE SENDING UNIT TEST