Fuel Pump (FP) Check-Valve, Checking

Fuel Pump (FP) Check-Valve, Checking

Test requirements
- Remote control is still connected.
- Pressure gauge is still connected.

Test sequence


NOTE: This test also checks the connections of the fuel supply line from Fuel Pump (FP) to connection point of V.A.G 1318 pressure gauge for proper seal.







- Close pressure gauge shut-off valve (lever perpendicular to direction of flow -position B-).
- Operate remote control in short intervals until a positive pressure of approx. 3 bar has built up.
- If excess pressure is built up, reduce pressure by carefully opening shut-off valve.

WARNING: Danger of spray when opening shut-off valve. Hold container in front of open connection on pressure gauge.

- Observe pressure drop on pressure gauge. Pressure must not fall below 2.5 bar within 10 minutes.

If pressure drops further:
- Check line connections for proper seal.

If no malfunctions are found in wires:
- Fuel Pump (FP) faulty, replace Fuel Pump (FP) unit, Fuel Pump (FP) unit, removing and installing.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes