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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 vapour 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. Remove the valve cap. Connect the pressure gauge equipment part no. 83 93 852 and the adapter 83 94 744 Fuel pressure gauge adapter to the fuel-injection rail with the "safety" on. Take off the "safety" from the adapter.


3. Start the fuel pump with the diagnostic tool.


4. Take a reading. It should be 3.0 bar (43 psi).

5. Detach the pressure regulator vacuum hose. Connect the vacuum pump 30 14 883 Pressure/vacuum pump to the coupling on the pressure regulator.


6. Carefully apply positive pressure. Make sure the fuel pressure increases correspondingly.

7. Release the positive pressure and apply negative pressure. Make sure the fuel pressure is reduced correspondingly.

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

9. Turn off the fuel pump with the diagnostic tool.

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

11. Fit the engine cover.