Fuel Pump (FP) check-valve, checking

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Test requirements

V.A.G 1348/3A remote control is still connected.
V.A.G 1318 pressure gauge is still connected.

Test sequence

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

Fig 1: Connecting VAG 1318 Components To Fuel Supply Line

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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 free connection on pressure gauge.

Observe pressure drop on pressure gauge. Pressure must not fall below

2.5 bar

after 10 minutes.

If pressure drops further:

Check line connections for proper seal.

If no malfunctions are found in wires:

Fuel Pump (FP) malfunctioning, replace Fuel Pump (FP) unit. Refer to Fuel Pump (FP) unit, removing and installing , Fuel Pump (FP) unit, removing and installing.
Erase DTC memory of Engine Control Module (ECM). Refer to Diagnostic mode 4: Reset/erase diagnostic data
Generate readiness code. Refer to Readiness code, generating