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Checking the fuel pressure regulator

Checking the fuel pressure regulator

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. Connect pressure gauge equipment, tool 83 93 852 and tool 83 94 744. Connect tool 83 94 744 to the fuel rail with the "safety" on. Release the "safety".


3. Start the fuel pump with the diagnostic tool.


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

5. Detach the vacuum hose from the pressure regulator. Connect the vacuum pump, tool 30 14 883, to 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. Reconnect the vacuum hose to the pressure regulator.

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

10. Apply the "safety" on tool 83 94 744 and remove the pressure gauge equipment from the service nipple.

11. Fit the engine cover.