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Checking residual pressure, V6

Checking residual pressure, V6

Warning

Checking residual pressure 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. Reduce fuel pressure by removing fuel pump fuse no. 19 while the engine is idling. Turn off the ignition once the engine has stopped and replace the fuse.


2. Remove the engine cover.

3. 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.

4. Start the fuel pump with the diagnostic tool.


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

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

7. Read the pressure gauge after 20 minutes. The residual pressure should be at least 2.3 bar (33 psi).

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

9. Fit the engine cover.