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Checking the fuel pressure regulator, 4-cyl.

Checking the fuel pressure regulator, 4-cyl.

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 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.


2. Detach the vacuum hose from the pressure regulator and attach the pressure/vacuum pump 30 14 883 Pressure/vacuum pump and the boost pressure gauge 83 93 514 Boost pressure gauge .


3. Start the fuel pump with the diagnostic tool.


4. Check the reading at barometric pressure. The reading should be 3 bar (43 psi).


5. Increase the negative pressure in the pressure regulator by means of the pressure/vacuum pump. System pressure should drop by the same amount as indicated on the pressure gauge.

System pressure

bar (psi)

3,0 (43)



6. Pump up the pressure in the pressure regulator with the vacuum pump. The system pressure should now increase with the same amount as the reading on the pressure gauge.


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

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