13 31...Notes on fuel pressure check (reference pressure: environment): Notes

Feature Of This Version With Ambient Pressure: 

The connection for the vacuum hose of the fuel pressure regulator is located between the throttle and the air cleaner or on the air cleaner.

Test Precondition: 

The correct fuel pressure regulator is fitted.

• Using the EPC, check whether the fuel pressure regulator suitable for the car is fitted:

  Connect test adapter, refer to 13 31 029 CHECKING FUEL PUMP DELIVERY PRESSURE (M54) .

Description Of Operation: 

The control function of the fuel pressure regulator must be guaranteed under all operating conditions. The fuel pump must always be able to generate a higher fuel pressure than the pressure regulated by the pressure regulator.

The injection rate is adjusted by means of the injection time; the injection time is controlled by the DME.