Fuel Pump: Testing and Inspection

Checking Fuel Pump Delivery Pressure (N62)

Special tools required:
- 13 5 220
- 61 3 050

Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Switch off ignition
- Remove acoustic cover
- Remove right ignition coil cover

Important:
Fuel in fuel lines is under pressure (approx. 3 - 5 bar).
Catch and dispose of escaping fuel.







Remove dust cap on measuring valve of fuel rail.
Unscrew non-return valve (1) on special tool kit 13 5 220.
Mount special tool kit 13 5 220 on fuel rail and tighten knurled nut until hand-tight.
Start engine.
Screw in non-return valve (1) until a pressure reading is indicated on the 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.

Measuring fuel pressure:
- Connect pressure sensor to DIS Tester
- Start engine.
- Select Measurement.
- Multimeter function appears
- Select Pressure test
- Read off fuel pressure


Switch off engine.

Checking fuel pump:
Remove 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).
Operate button and read off fuel pump delivery pressure at DIS Tester.
Delivery pressure, refer to Specifications.

Notes on fuel pressure check.

Installation: Now clear the fault memory.