Fuel Pump: Testing and Inspection

13 31 029 Checking Fuel Pump Delivery Pressure

Special tools required:
- 13 5 220
- 13 5 221
- 13 5 222

IMPORTANT: The fuel in the fuel lines is under pressure (approx. 5 bar). Catch and dispose of escaping fuel.

Necessary preliminary tasks:
- Switch off ignition.
- Remove acoustic cover







Remove dust cap (1).







Connect special tool kit 13 5 220 (comprising 13 5 221 and 13 5 222) to pressure sensor of DIS Tester. Connect pressure sensor to DIS Tester.

IMPORTANT:
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.







Mount special tool kit 13 5 220 to injection tube and tighten knurled nut hand-tight.
Screw out check valve (1) so that valve in pressure regulator housing is closed.
Start engine.
Screw in check valve (1) until a pressure reading is indicated on DIS Tester.

Measuring fuel pressure.
- Select Measurement.
- Multimeter function appears
- Select Pressure test
- Read off value of fuel pressure.
Compare actual value of test pressure with specified value.
Test pressure / nominal value 5.0 ± 0.02 bar
Switch off engine.

NOTE: Removing special tool kit 13 5 220:

- Switch off engine
- Screw out check valve fully again.
- Remove special tool kit 13 5 220 from pressure regulator housing.
- Catch and dispose of escaping fuel.

NOTE:
Read out fault memory of DME control unit.
Check stored fault messages.
Now clear the fault memory.