16 00 Fuel supply system (petrol/gasoline)
1. General
General function description of fuel system. Refer to 16 00 GENERAL FUNCTION DESCRIPTION FOR FUEL SUPPLY SYSTEMS .
2. Component designation
Schematic drawing of fuel supply systems
Scheme 83
3. Function description (see also (Scheme 83)
Fuel system
The saddle-shaped fuel tank contains the surge chamber with integrated electric fuel pump on its right side.
The surge chamber ensures that the fuel pump is properly supplied in all vehicle operating states.
The fuel is pumped from the right side of the fuel tank into the surge chamber via the suction jet pump integrated in the surge chamber.
The suction jet pump in the left fuel tank half pumps the fuel through the tank expansion line to the right side of the fuel tank.
The suction jet pump is operated via the fuel feed line.
Return line, pressure regulator and fuel filter are located in the tank.
Fuel supply to engine
The fuel is routed from the electric fuel pump via the fuel feed line and the fuel filter/pressure regulator unit to the fuel rail.
Pressure regulator and fuel filter are incorporated in a single unit in the tank. There is thus no need for a fuel return line.
The fuel passes through the pressure regulator into the left side of the fuel tank and thereby drives a suction jet pump. This pump repumps the fuel from the left side of the tank to the right side.
The fuel rail is return-free.
Tank venting system (US version)
The fuel tank is vented during refueling via the refueling vent line.
Because of its large cross-section, the refueling vent line directs the displaced volume (fuel vapours) at high speed through the expansion volume to the carbon canister.
The activated carbon retains the fuel contained in the fuel vapours. The cleaned air is discharged to atmosphere via the evaporation line, the tank leak diagnosis module and the dust filter.
During driving, the system tank is vented in the same way via the vent line.
The condensed constituents of the fuel vapours remain in the tank because the tank has an integrated compensating volume.
The refueling cutout valve in the tank is closed by the rising fuel if the tank is overfilled. The ventilation function is maintained by a second float valve.
Al three valves are designed as rollover valves. This prevents fuel from escaping from the fuel tank in extreme vehicle positions (overturning, inclined position).
The carbon canister is regenerated by purging with fresh air.
The DME control unit opens the tank vent valve. Thus the vacuum pressure of the engine intake manifold is applied at the purge air line. The carbon canister is purged in this way. The fresh air needed for this purpose is supplied via the tank leak diagnosis module and the dust filter. The fuel constituents bound by the activated carbon are flushed out by the supplied air and directed via the purge line to the engine for combustion.
This operation is only possible while the engine is running.
Tank venting system (worldwide)
Refer to TANK VENTING SYSTEM (US VERSION) with following differences
- Carbon canister has a smaller capacity.
- No tank leak diagnosis module or dust
Leak diagnosis for tank venting system (US version)
The tank leak diagnosis module (Scheme 83) serves to diagnose leakages for the tank venting system within the on -board diagnosis laid down by legislation.
The tank venting system is pressurized and the pressure loss is detected in the event of a leak.
The tank leak diagnosis module is activated by the DME control unit and detects the pressure loss by way of the power consumption of the integrated pump. The air required for this purpose is supplied via the dust filter.
The pressure test line establishes the connection between fuel tank and fuel filler neck. This enables a leak to be detected in the fuel filler pipe - fuel tank cap area.
Determining fill level in fuel tank
The fuel level is measured by means of lever-type sensors on both sides of the fuel tank. The combination of the determined ohm values from the right and left lever-type sensors produces the actual level in the fuel tank.
4. Service data, fuel system
Fuel pump operating pressure. Refer to FUEL SUPPLY SYSTEM - TECHNICAL DATA .
Fuel supply systems, spark-ignition engines
Fuel system
The electric fuel pump in the fuel tank generates the pressure in the fuel system which is set by the pressure regulator to a specific level.
Tank venting system
The tank venting system is an enclosed system which is vented via a carbon canister. The carbon is incorporated in the carbon canister as granulate. The large surface of the carbon stores the fuel vapors which occur in the fuel tank. The carbon canister must be regenerated on a regular basis so as to be able to continue storing fuel vapors. Regeneration is performed by way of purging with fresh air via the intake manifold. This process is controlled by the engine control unit.
Fuel supply systems, diesel engines
Fuel system
The electric fuel pump in the fuel tank supplies the engine with fuel. Two types of high -pressure pump are used for cylinder injection.
- The distributor injection pump supplies each cylinder directly with fuel via the corresponding injection nozzle.
- The high-pressure pump for the common rail systems generates in the fuel rail the necessary pressure for all the injection nozzles.
In common rail systems, a further pump (inline pump, M57/gear pump, M67) is connected between the high -pressure pump and the electric fuel pump. This pump supports the fuel pump in the fuel tank in the event of a high fuel demand.
Tank venting system
Diesel fuel is non-volatile and therefore a carbon canister is not required. The fuel tank is vented directly to atmosphere.
16 00 005 Draining and filling fuel tank
Special tools required
- 16 1 020
| IMPORTANT | Observe country-specific safety regulations. Ensure adequate ventilation in the place of work! Connect the exhaust and extraction systems to the exhaust tailpipe. The electric fuel pump must not operate without fuel! After completing repairs but before starting the engine for the first time, fill the fuel tank with min. 5 l fuel through the fuel filler pipe. Do not damage non-return flap when pulling out extraction hose. |
Drawing Off Fuel
Start engine and allow to run. The electric fuel pump runs.
In this way, the fuel is repumped through the suction jet pump from the left to the right side of the fuel tank.
Note. Fuel can be drawn out of left and right sides of tank through filler neck, leaving only a small residue. The residual quantity is drawn off through the service opening (on right/left).
Slide extraction hose of extractor unit, refer to BMW Service Workshop Equipment and Planning Documentation, into the fuel filler pipe, turning in the process if necessary.
Scheme 84
Draw off fuel as much as possible with extractor unit, refer to BMW Service Workshop Equipment and Planning Documentation.
Follow drawing off of fuel on fuel gauge in instrument cluster.
Drawing Off Residual Fuel Quantity
| IMPORTANT | Ensure car interior is adequately ventilated. |
Catch dripping fuel in a suitable container.
Release sealing ring with special tool 16 1 020 and remove cap for service opening (left/right).
Scheme 85
Tightening torque, 16 14 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Draw off residual fuel quantity through service openings.
Fuel Filling
Slide extraction hose of extractor unit, refer to BMW Service Workshop Equipment and Planning Documentation, approx. 40 cm into fuel filler pipe.
Scheme 86
Fill fuel from suction extractor unit.
Drawing Off After Fault In Suction Jet Pump
Draw off right half of tank completely through fuel filler pipe. Remove cap from left service opening.
Insert extraction hose through service opening in tank, fuel (also residual quantity) can be drawn off.
Scheme 87
16 00 100 Checking fuel tank and tank ventilation system for leaks
Special tools required
- 13 3 010
- 16 1 070
- 16 1 171
- 16 1 174
Note. The following procedure is only applicable to vehicles without the tank leak diagnosis module.
Check tank venting system if a leak is suspected.
Comply with the following conditions in order to obtain plausible test results
- Content of fuel tank: Maximum 90 % Minimum 13 % (reserve telltale must not light up).
- Park the car in the workshop at least 2 hours before the test so that the fuel temperature is approximately that of the workshop temperature (ideal fuel temperature approx. 10...20 °C).
- Never refuel the vehicle directly prior to the leak test due to the strong emission of gas by the fresh fuel.
Remove rear right wheel arch trim.
Remove evaporation strainer (1) from carbon canister.
Scheme 88
| IMPORTANT | Risk of breakage! |
Carefully remove evaporation strainer with a screwdriver from carbon canister.
Using special tool 16 1 070, seal opening for evaporation strainer on carbon canister.
Note. Cut off special tool 16 1 070 to seal opening to evaporation strainer.
Remove fuel filler cap and connect special tool 16 1 174 to fuel filler neck.
Scheme 89
Clamp special tool 16 1 174 on fuel filler neck with adjusting wheel (1).
| IMPORTANT | Set pressure regulator on special tool 16 1 171 fully in "-" direction. |
Connect special tool 16 1 171 using compressed air line (1) to garage compressed air system (8...10 bar).
Scheme 90
Connect pressure sensor (2) from Diagnosis and Information System with a measuring range of 0...3.5 bar.
| IMPORTANT | Do not connect fast-release coupling (3) of special tool 16 1 171. |
Select "Measurement" function on Diagnosis and Information System (DIS).
Using pressure regulator on special tool 16 1 171, increase pressure by 0.050 bar.
Connect special tool 16 1 174 to fast-release coupling of special tool 16 1 171.
Using pressure regulator on special tool 16 1 171, reset gauge pressure in fuel tank to 0.050 bar.
| IMPORTANT | Do not under any circumstances increase pressure by more than 0.05 bar as this would result in damage to the fuel tank and venting system. |
Using special tool 13 3 010, disconnect delivery line from special tool 16 1 171 to fuel filler neck.
Allow a rest period of approx. 20 secs.
Read off and note down starting pressure value. Wait approx. 60 secs.
Read off final pressure value and compare with starting pressure value.
Measurement evaluation
| Pressure drop between 0.008 and 0.010 bar. | Measure again. |
|---|---|
| Pressure drop in 60 secs. greater than 0.010 bar. | System leaking beyond permitted levels. Carry out leak test. Refer to 16 00 510 CONDUCTING LEAK TEST ON FUEL TANK AND TANK VENTILATION SYSTEM . |
MEASUREMENT EVALUATION
16 00 102 Checking fuel tank and tank venting system for leaks with tank leakage diagnosis module (DM-TL)
Note. An OBD fault is indicated by the "Check Engine" indicator lamp in the instrument cluster lighting up. This may indicate a leak in the tank venting system. Information on this is provided by the fault memory of the DME control unit.
- Read out fault memory of DME control unit and carry out a diagnosis in accordance with faults stored.
- A leak test with the DM -TL module is then carried out if: The components of the DM-TL module are O.K. An error is stored in the DME fault memory (tank leak detected). Adhere to following conditions in order to carry out a correct leak test
- Content of fuel tank < 90 %
- Reserve indicator lamp "off"
- Leave car in workshop for at least 2 hours so that fuel temperature comes into line with workshop temperature (ideal fuel temperature approx. 10...20 °C).
- Do not under any circumstances fill up car with fresh fuel (strong exhalation of fresh fuel).
- Check that fuel tank cap is correctly seated.
| WARNING | During the leak test, under no circumstances apply external pressurization through the fuel filler neck as this may cause incorrect readings. |
Clear DME fault memory.
In the Diagnosis and Information System (DIS), go to the "Function and component selection" page.
Work through tank leakage diagnosis module. Leakage test is carried out.
If fault is recorded again in DME fault memory (tank leak detected), carry out leak test. Refer to 16 00 510 CONDUCTING LEAK TEST ON FUEL TANK AND TANK VENTILATION SYSTEM .
16 00 510 Conducting leak test on fuel tank and tank ventilation system
Note. The following procedure is only applicable to vehicles with the tank leak diagnosis module (DMTL).
For vehicles without tank leak diagnosis module: Pressurize fuel tank and tank venting system. Refer to 16 00 100 CHECKING FUEL TANK AND TANK VENTILATION SYSTEM FOR LEAKS .
During the leak test with a leak detector, be sure to follow the operating instructions of the equipment manufacturer.
Note. Select "Tank leak diagnosis module (DMTL)" on Diagnosis and Information System (DIS).
- The leak diagnosis pump pressurizes the fuel tank and tank ventilation system for 30 secs.
- If pressure is needed for longer than 30 secs., press "Activate" button again after 30 secs.
| IMPORTANT | On vehicles with tank leak diagnosis modules (DMTL), do not work with external pressurization as the tank ventilation system will leak under this condition. |
On account of emerging fuel vapours, carry out all work in well ventilated rooms. Or use a suitable extractor system.
Observe country-specific accident prevention and occupational safety regulations.
The leak test can be carried out with a leak detector. Possible causes may be
Scheme 91
- Tank cap leaking (check tank cap pressure relief valve).
- Tank venting lines leaking (fuel tank - carbon canister - tank venting valve).
- Tank vent line leaking (engine compartment).
- Fuel level sensor flange on tank leaking.
16 11 030 Removing and installing fuel tank
Special tools required
- 13 5 281
- 13 5 282
| IMPORTANT | After installation of fuel tank/prior to first engine start-up |
- Check ground connection at fuel filler neck to body for continuity. If necessary, clean contact surface between body and fuel filler pipe screw connection.
- Fill fuel tank with min. 5 l fuel.
Necessary preliminary tasks
- Draw off fuel from fuel tank, refer to «16 00 005 DRAINING AND FILLING FUEL TANK»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-00-005-draining-and-filling)
- Remove rear seat bench, refer to «52 26 005 REMOVING AND INSTALLING/REPLACING REAR SEAT (THROUGH-LOADING SYSTEM)»(/bmw/x3/e83-2003-2006/remont/seats/#seats-repair-instructions__52-26-005-removing-and-installingreplacing)
- Remove underbody panelling, refer to «51 47 ... REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT UNDERBODY PANELING»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-47-removing-and-installingreplacing)
- Remove handbrake Bowden cables, refer to «34 41 120 REMOVING AND INSTALLING/REPLACING BOTH HANDBRAKE BOWDEN CABLES»(/bmw/x3/e83-2003-2006/remont/mechanical-hydraulic/#brakes-repair-instructions__34-41-120-removing-and-installingreplacing)
- Remove complete propeller shaft, refer to «26 11 000 REMOVING AND INSTALLING PROPELLER SHAFT (CARDAN UNIVERSAL JOINT) COMPLETELY»(/bmw/x3/e83-2003-2006/remont/driveshaft-universal-joints/#propeller-shaft-repair-instructions__26-11-000-removing-and-installing)
Release screws (1) and remove cover (2) from right side of fuel tank.
Scheme 92
Right side
Disconnect plug (1) and service vent line (3) from delivery unit.
Scheme 93
Left side (diesel only)
Unlock quick-release fastener (1) and detach vent line.
Scheme 94
Release hose clamp (1) and detach fuel filler hose (2).
Scheme 95
Installation
Tightening torque, 16 12 10AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Unclip line (3) from holders.
Unlock and disconnect fuel feed line (1).
Scheme 96
Unlock and disconnect fuel return line (2).
Release screw and unclip lines (1) from holder.
Scheme 97
| IMPORTANT | Risk of damage: Do not kink lines. |
Seal fuel feed line with special tools 13 5 281 and 13 5 282.
Scheme 98
Heavily support the fuel tank.
Scheme 99
Release screw.
Scheme 100
Installation
Tightening torque, 16 11 1AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Release screws for tightening straps on left and right and remove tightening straps.
Scheme 101
Installation
Tightening torque, 16 11 1AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Installation
Note rubber mount with spacer bush.
Wide collar on spacer bush points to screw head.
Scheme 102
Lower tank until line (1) is accessible.
Scheme 103
Unclip line (1) from holders.
Remove fuel tank downwards.
| IMPORTANT | Risk of damage: Feed out fuel line (2). |
Do not kink fuel line.
Note. Illustration shows: tank removed.
Note. The following components must be modified when the fuel tank is replaced: Left sensor unit, refer to 16 12 001 REMOVING AND INSTALLING / REPLACING FUEL GAUGE SENSOR (PETROL / GASOLINE, LEFT) Right sensor unit, refer to 16 12 000 REMOVING AND INSTALLING / REPLACING FUEL GAUGE SENSOR (PETROL / GASOLINE, RIGHT) Fuel lines on tank
16 11 060 Removing and installing or replacing fuel filler pipe
Necessary preliminary tasks
- Remove rear right wheel arch trim, refer to «51 71 041 REMOVING AND INSTALLING/REPLACING REAR LEFT OR RIGHT WHEEL ARCH TRIM»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-71-041-removing-and-installingreplacing)
- Draw off fuel from fuel tank, refer to «16 00 005 DRAINING AND FILLING FUEL TANK»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-00-005-draining-and-filling)
Unhook retaining strap (1) from tank flap.
Scheme 104
Open cap and set to one side.
Unfasten hose clip (4).
Scheme 105
Installation
Replace hose clip.
Tightening torque, 16 12 10AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Note. With petrol/gasoline engine only!
Detach vent line (1) and (2) from fuel filler pipe.
Scheme 106
Note. With diesel engine only!
Unclip vent line (1) from holder on fuel filler pipe (2).
Scheme 107
Unscrew nuts.
Scheme 108
Tightening torque, 16 12 11AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Unclip vent line (2) from holder on fuel filler pipe (1).
Unscrew nut (1).
Scheme 109
Tightening torque, 16 12 16AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Withdraw fuel filler pipe (2) completely out of rubber gaiter at wheel arch.
Installation
Make sure rubber gaiter is correctly seated.
Installation
Clean contact surface on body and grounding lead on fuel filler pipe.
Ground connection must be guaranteed.
16 11 130 Checking filler cap pressure relief valve
Special tools required
- 13 3 010
- 16 1 171
- 16 1 172
Set pressure regulator on special tool 16 1 171 fully in "-" direction.
Scheme 110
Connect special tool 16 1 171 via compressed air line (1) to workshop/garage compressed air system (8...10 bar).
Connect pressure sensor (2) from Diagnosis and Information System.
Connect special tool 16 1 172 to fast-release coupling of special tool 16 1 171.
Scheme 111
Install fuel tank cap on special tool 16 1 172 (3).
Note. Only the absolute pressure is indicated in the display of the Diagnosis and Information System (DIS). The current ambient air pressure is already displayed without additional pressurization.
Check testing equipment for leaks.
Select "Measurement/ Pressure" function on Diagnosis and Information System (DIS).
Increase pressure by 0.2 bar with pressure regulator on special tool 16 1 171.
Using special tool 13 3 010, disconnect supply line from special tool 16 1 171.
Read off and note down pressure. Wait 60 secs.
Read off pressure again and compare with starting pressure value.
| Pressure drop > 0.012 bar | Testing equipment leaking. Check connection points for leaks. |
MEASUREMENT EVALUATION
Check filler cap pressure relief.
Select "Measurement/ Pressure" function on Diagnosis and Information System (DIS).
Increase pressure by 0.3 bar with pressure regulator on special tool 16 1 171.
Using special tool 13 3 010, disconnect supply line from special tool 16 1 171.
Read off and note down pressure.
Wait 60 secs.
Read off pressure value again and compare with starting pressure value.
| Pressure drop > 0.012 bar | Filler cap pressure relief valve faulty. Replace fuel tank cap. |
MEASUREMENT EVALUATION
16 12 000 Removing and installing / replacing fuel gauge sensor (petrol / gasoline, right)
Special tools required
- 16 1 020
- 61 1 150
| IMPORTANT | Ensure adequate ventilation in the place of work! |
Ensure absolute cleanliness when working on the open fuel tank.
Contaminants in the fuel tank can impair driving operation or may even result in vehicle breakdown!
Note. Removed lever-type sensor with cable length of 400 mm must no longer be fitted. Only lever-type sensor with cable length of 335 mm may be refitted.
Necessary preliminary tasks
- Draw off fuel from fuel tank, refer to «16 00 005 DRAINING AND FILLING FUEL TANK»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-00-005-draining-and-filling)
- Remove rear seat bench, refer to «52 26 005 REMOVING AND INSTALLING/REPLACING REAR SEAT (THROUGH-LOADING SYSTEM)»(/bmw/x3/e83-2003-2006/remont/seats/#seats-repair-instructions__52-26-005-removing-and-installingreplacing)
Release screws (1) and remove cover (2) from right side of fuel tank.
Scheme 112
Unfasten plug connection (1) and disconnect.
Scheme 113
Unlock and disconnect fuel feed line (2).
| IMPORTANT | Press the blue button to unlock the quick-release fastener. Then carefully detach fuel feed line vertically upwards. Do not use any mechanical tools or means to detach the quick-release fastener. Quick-release fastener must be attached vertically without mechanical tools/means. It must snap audibly into place. Then carry out a leak test with engine running. Damaged or leaking quick-release fasteners must be replaced. |
Unlock and detach vent line (3).
Release screw cap with special tool 16 1 020 and remove.
Scheme 114
Installation
Tightening torque 16 14 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Installation
Service cap can only be installed in one position.
Scheme 115
When installing, make sure lug (1) of service cap engages in corresponding opening (2) on fuel tank.
During torque tightening, notch (3) on screw cap can be clearly heard and felt to engage toothed segment (4) on fuel tank.
Replace rubber gasket.
| IMPORTANT | Make sure that tab (1) of adapter ring lies completely in recess (2). |
Scheme 116
Carefully raise service cap (4).
Scheme 117
Unlock and detach fuel line (2).
Unlock and detach vent line (3).
Disconnect connector (1).
| IMPORTANT | Carefully release quick-release fasteners and detach. |
Make sure quick-release fasteners are correctly engaged.
Test the quick-release fasteners by pulling on them.
Installation
Cable (1) must be laid in a loop around the corrugated tube (2). Cable must not restrict freedom of movement of lever-type sensor!
Scheme 118
Unlock and disconnect plug connection (1) using a screwdriver (2).
Scheme 119
Unpin yellow cable (1) using special tool 61 1 131 from special tool kit 61 1 150.
Scheme 120
Removing fuel level sensor
- Disengage cable from guides (3 and 4).
- Carefully pull tab (1) in direction of arrow; at the same time, press tab (2) in direction of arrow and press out fuel level sensor downwards.
Scheme 121
| IMPORTANT | Risk of damage: Carefully feed cable out of cable guides (3 and 4). Do not kink cable. |
Installation
Observe the following procedure when installing the fuel level sensor.
Scheme 122
- Carefully push fuel level sensor (1) in direction of arrow onto sensor holder (2).
- Fuel level sensor must snap audibly into place!
Make sure fuel level sensor is correctly positioned in both guides (see arrows).
Secure cable with cable tie to corrugated tube (as close as possible to plug connection).
Illustration shows cutaway model
Installation
Lay cable (1) through upper loop of tank support (2).
Scheme 123
16 12 001 Removing and installing / replacing fuel gauge sensor (petrol / gasoline, left)
Special tools required
- 16 1 020
| IMPORTANT | Ensure adequate ventilation in the place of work! |
Ensure absolute cleanliness when working on the open fuel tank.
Contaminants in the fuel tank can impair driving operation or may even result in vehicle breakdown!
Necessary preliminary tasks
- Draw off fuel from fuel tank, refer to «16 00 005 DRAINING AND FILLING FUEL TANK»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-00-005-draining-and-filling)
- Remove rear seat bench, refer to «52 26 005 REMOVING AND INSTALLING/REPLACING REAR SEAT (THROUGH-LOADING SYSTEM)»(/bmw/x3/e83-2003-2006/remont/seats/#seats-repair-instructions__52-26-005-removing-and-installingreplacing)
Release screws (1) and remove cover (2) from left side of fuel tank.
Scheme 124
Release screw cap with special tool 16 1 020 and remove.
Scheme 125
Installation
Tightening torque 16 14 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Installation
Service cap can only be installed in one position.
Scheme 126
When installing, make sure lug (1) of service cap engages in corresponding opening on fuel tank.
During torque tightening, notch (3) on screw cap can be clearly heard and felt to engage toothed segment (4) on fuel tank.
Replace rubber gasket.
| IMPORTANT | Make sure that tab (1) of adapter ring lies completely in recess (2). |
Scheme 127
Disconnect plug (1) from fuel level sensor.
Scheme 128
Removing fuel level sensor
Scheme 129
- Disengage cable from guides (3 and 4).
- Carefully pull tab (1) in direction of arrow; at the same time, press tab (2) in direction of arrow and press out fuel level sensor downwards.
| IMPORTANT | Risk of damage |
Carefully feed cable out of cable guides (3 and 4). Do not kink cable.
Installation
Observe the following procedure when installing the fuel level sensor.
Scheme 130
- Carefully push fuel level sensor (1) in direction of arrow onto sensor holder (2).
- Push on fuel level sensor up to end stop. Fuel level sensor must snap audibly into place!
Make sure fuel level sensor is correctly positioned in both guides (see arrow).
Installation
Engage cable (1) in cable guide (2) and lay behind lines (3).
Scheme 131
Cable must not restrict freedom of movement of lever-type sensor!
16 12 010 Removing and installing/replacing carbon canister
Necessary preliminary tasks
- Remove rear right wheel. Refer to «36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL»(/bmw/x3/e83-2003-2006/remont/wheel-tire-system/#wheel-and-tires-repair-instructions__36-10-300-removing-or-installing) .
- Remove rear right wheel arch trim. Refer to «51 71 041 REMOVING AND INSTALLING/REPLACING REAR LEFT OR RIGHT WHEEL ARCH TRIM»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-71-041-removing-and-installingreplacing) .
Disconnect vent line (1) and (2) from carbon canister (3).
Scheme 132
Unfasten nut.
Tightening torque 16 13 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Remove carbon canister (3).
16 12 010 Removing and installing/replacing carbon canister with DM-TL
DM-TL = diagnosis module for tank leakage
Necessary preliminary tasks
- Remove rear right wheel. Refer to «36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL»(/bmw/x3/e83-2003-2006/remont/wheel-tire-system/#wheel-and-tires-repair-instructions__36-10-300-removing-or-installing) .
- Remove rear right wheel arch cover. Refer to «51 71 041 REMOVING AND INSTALLING/REPLACING REAR LEFT OR RIGHT WHEEL ARCH TRIM»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-71-041-removing-and-installingreplacing) .
Unlock lines (1), (2) and plug (3) and detach.
Scheme 133
- Scavenging air line
- Vent line to tank
Release screws (5) and remove carbon canister with DM -TL towards bottom.
Tightening torque 16 13 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
16 13 015 Removing and installing/replacing tank leakage diagnosis module
Necessary preliminary tasks
- Remove carbon canister with DMTL. Refer to «16 12 010 REMOVING AND INSTALLING/REPLACING CARBON CANISTER WITH DM-TL»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-12-010-removing-and-installingreplacing) .
Unlock and disconnect line (1) from tank leakage diagnosis module.
Scheme 134
Loosen screws (2).
Tightening torque 16 13 3AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Detach DMTL from carbon canister.
16 14 010 Removing and installing / replacing fuel pump (petrol / gasoline)
Special tools required
- 16 1 020
| IMPORTANT | Ensure adequate ventilation in the place of work! Ensure absolute cleanliness when working on the open fuel tank. |
Contaminants in the fuel tank can impair driving operation or may even result in vehicle breakdown!
Necessary preliminary tasks
- Draw off fuel from fuel tank, refer to «16 00 005 DRAINING AND FILLING FUEL TANK»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-00-005-draining-and-filling)
- Remove rear seat bench, refer to «52 26 005 REMOVING AND INSTALLING/REPLACING REAR SEAT (THROUGH-LOADING SYSTEM)»(/bmw/x3/e83-2003-2006/remont/seats/#seats-repair-instructions__52-26-005-removing-and-installingreplacing)
Release screws (1) and remove cover (2) from right side of fuel tank.
Scheme 135
Unlock and detach plug (1), fuel feed line (2) and service vent line (3).
Scheme 136
Release screw cap with special tool 16 1 020 and remove service cap.
Scheme 137
Installation
Tightening torque 16 14 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Installation
Service cap can only be installed in one position.
Scheme 138
When installing, make sure lug (1) of service cap engages in corresponding opening (2) on fuel tank.
During torque tightening, notch (3) on screw cap can be clearly heard and felt to engage toothed segment (4) on fuel tank.
Replace rubber gasket.
| IMPORTANT | Make sure that tab (1) of adapter ring lies completely in recess (2). |
Scheme 139
| IMPORTANT | Carefully raise service cap (4) on right. |
Disconnect connector (1).
Unlock and detach fuel line (2).
Detach vent line (3).
Unlock and detach plug (1), fuel feed line (2) and filler vent line (3).
Installation
Cable (1) must be laid in a loop around the corrugated tube (2).
Cable must not restrict freedom of movement of lever-type sensor!
Scheme 140
Unlock and disconnect plug housing (1) using a screwdriver (2).
Scheme 141
Disconnect plug connection (1).
Scheme 142
Press retaining lug (2) together simultaneously in direction of arrow and detach fuel line (1) from pressure regulator.
Scheme 143
Detach line (1) in direction of arrow from surge chamber.
Scheme 144
Installation
Line (1) must snap audibly into place.
Press retaining lug (1) in direction of arrow towards rear and lift out fuel pump with surge chamber (2).
Scheme 145
Installation
Fuel pump can only be installed in one position.
Make sure lug (4) of mounting engages opening in fuel pump.
Make sure fuel pump (2) is correctly positioned in guides (3).
16 14 016 Removing and installing/replacing fuel filter with pressure regulator
Special tools required
- 16 1 020
| IMPORTANT | Ensure adequate ventilation in the place of work! Ensure absolute cleanliness when working on the open fuel tank. |
Contaminants in the fuel tank can impair driving operation or may even result in vehicle breakdown!
Necessary preliminary tasks
- Draw off fuel from fuel tank, refer to «16 00 005 DRAINING AND FILLING FUEL TANK»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-00-005-draining-and-filling)
- Remove rear seat bench, refer to «52 26 005 REMOVING AND INSTALLING/REPLACING REAR SEAT (THROUGH-LOADING SYSTEM)»(/bmw/x3/e83-2003-2006/remont/seats/#seats-repair-instructions__52-26-005-removing-and-installingreplacing)
Release screws (1) and remove cover (2) from right side of fuel tank.
Scheme 146
Release sealing ring with special tool 16 1 020 and remove cap for service opening.
Scheme 147
Tightening torque 16 14 2AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Installation
Service cap can only be installed in one position.
Scheme 148
When installing, make sure lug (1) of service cap engages in corresponding opening on fuel tank.
Always replace seal (2).
Press retaining lugs (2) together simultaneously in direction of arrow and detach fuel line (1) from pressure filter.
Scheme 149
Unlock line connection (1) and detach from pressure regulator.
Scheme 150
Remove fuel filter with pressure regulator (1) from mounting in direction of arrow.
Scheme 151
Installation
When installing, make sure that turning lock (1) on fuel filter engages opening (2) on fuel filter holder.
Scheme 152
Disconnect grounding cable (1) from pressure regulator and fuel filter.
Scheme 153
16 14 060 Removing and installing/replacing dust filter for tank leakage diagnosis module (DM-TL)
Necessary preliminary tasks
- Remove rear right wheel arch cover. Refer to «51 71 041 REMOVING AND INSTALLING/REPLACING REAR LEFT OR RIGHT WHEEL ARCH TRIM»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-71-041-removing-and-installingreplacing) .
- Remove carbon canister. Refer to «16 12 010 REMOVING AND INSTALLING/REPLACING CARBON CANISTER WITH DM-TL»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-supply-system-repair-m54__16-12-010-removing-and-installingreplacing) .
Disconnect line (2) from DM-TL.
Scheme 154
Unscrew screw.
Tightening torque 16 13 4AZ. Refer to FUEL SUPPLY SYSTEM - TIGHTENING TORQUES .
Remove dust filter (1) with line (2).
See also:
• FUEL SUPPLY SYSTEM - TECHNICAL DATA
• FUEL SUPPLY SYSTEM - TIGHTENING TORQUES
• 52 26 005 REMOVING AND INSTALLING/REPLACING REAR SEAT (THROUGH-LOADING SYSTEM)
• 51 47 ... REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT UNDERBODY PANELING
• 34 41 120 REMOVING AND INSTALLING/REPLACING BOTH HANDBRAKE BOWDEN CABLES
• 26 11 000 REMOVING AND INSTALLING PROPELLER SHAFT (CARDAN UNIVERSAL JOINT) COMPLETELY
• 51 71 041 REMOVING AND INSTALLING/REPLACING REAR LEFT OR RIGHT WHEEL ARCH TRIM
• 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL
• 16 00 GENERAL FUNCTION DESCRIPTION FOR FUEL SUPPLY SYSTEMS
• 16 00 510 CONDUCTING LEAK TEST ON FUEL TANK AND TANK VENTILATION SYSTEM
• 16 00 100 CHECKING FUEL TANK AND TANK VENTILATION SYSTEM FOR LEAKS
• 16 00 005 DRAINING AND FILLING FUEL TANK
• 16 12 001 REMOVING AND INSTALLING / REPLACING FUEL GAUGE SENSOR (PETROL / GASOLINE, LEFT)
• 16 12 000 REMOVING AND INSTALLING / REPLACING FUEL GAUGE SENSOR (PETROL / GASOLINE, RIGHT)
• 16 12 010 REMOVING AND INSTALLING/REPLACING CARBON CANISTER WITH DM-TL