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Checking the fuel pressure regulator, V6

Checking the fuel pressure regulator, 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. Remove the engine cover.

2. 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".


3. Start the fuel pump using the diagnostics tool.


4. Take a pressure reading on the gauge. The value should be 3.0 bar (43 psi).

5. Detach the pressure regulator vacuum hose. Connect the vacuum pump, part no. 30 14 883, to the connector on the pressure regulator.


6. Pump carefully up a positive pressure. Check that the fuel pressure increases correspondingly.

7. Release the positive pressure and pump up a negative pressure instead (vacuum). Check that the fuel pressure reduces correspondingly.

8. Release the negative pressure and remove the vacuum pump. Connect the pressure regulator vacuum hose.

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

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

11. Refit the engine cover.