Checking Fuel Pump Delivery Pressure (M54)

13 31 029 - Checking fuel pump delivery pressure (M54)





Special tools required:
- 13 3 010 13 3 010 Hose Clip
- 13 5 220 13 5 220 Adapter
- 61 3 050

Switch off ignition.





Caution!
The fuel in the fuel lines is under pressure (approx. 3 bar)!

Catch and dispose of escaping fuel.





Remove cover from fuel injectors.





Remove dust cap (1) from measuring valve on fuel rail.





Prepare special took kit 13 5 220 13 5 220 Adapter (consisting of 13 5 221 and 13 5 222).





Unscrew check valve (1) on special tool kit 13 5 220 13 5 220 Adapter.

Fit special tool kit 13 5 220 13 5 220 Adapter on measuring valve and tighten knurled nut until hand-tight.

Start engine.

Screw in check valve (1) until a pressure reading is indicated on DIS Tester.

Caution!
Do not under any circumstances screw in the check valve up to the mechanical stop. This could damage the valve in the pressure regulator housing.





Measuring fuel pressure:

- Connect pressure sensor to DIS Tester
- Start engine.
- Select Measurement.
- Multimeter function appears
- Select Pressure test
- Read off fuel pressure
Compare actual value of test pressure with specified value. Injectors and Lines, Fuel Pressure Regulator M54/B30

Switch off engine.





Checking fuel pump:

Detach fuel pump relay.





Note:
Check whether fuel pump no longer starts up during engine starting procedure (engine fails to start).





Connect special tool 61 3 050 to terminal (87) and terminal (30).

Press button and read off fuel pump delivery pressure on DIS Tester.

Compare actual value with specified value of delivery pressure.





Keep special tool 13 3 010 13 3 010 Hose Clip ready for further tests.

Further tests are described in the section "Fuel pressure check" Notes on Fuel Pressure Check (Reference Pressure - Environment).





Note:
Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults.

Then clear fault memory.