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Checking the fuel pressure, V6

Checking the fuel pressure, V6

Warning

Removal of the fuel pressure regulator involves partial dismantling of the car's fuel system. The following points must therefore be observed in connection with this work:

• Work only in a well-ventilated area! If approved equipment for the extraction of fuel vapours is available, be sure to use it.

• Wear suitable gloves! Prolonged contact with fuel can cause skin irritation or dermatitis.

• Keep a class BE fire extinguisher near at hand! Be mindful of the danger of sparks caused by short circuits and when connecting and disconnecting leads in electrical circuits.

• No smoking anywhere in the vicinity.

• Wear protective goggles.




1. Reduce the fuel pressure by removing the fuel pump fuse no. 19 while the engine is idling. When the engine stops, turn off the ignition and refit the fuse.


2. Remove the engine cover.

3. Unscrew the valve cap. Connect the pressure gauge equipment, part no. 83 93 852, and the adapter, part no. 83 94 744. Connect the adapter to the fuel rail with the "safety catch" on. Release the "safety catch".

4. Start the fuel pump using the diagnostics tool.


5. Take a reading from the measuring equipment.

System pressure

bar (psi)

3.0 (43)



6. Switch off the fuel pump using the diagnostics tool.

7. Put on the "safety catch" on the adapter and remove the pressure gauge equipment from the service nipple. Screw on the valve cap.

8. Refit the engine cover.