Fuel Pump Check Valve

WARNING! Fire hazard! DO NOT smoke or work near heaters or have anything in the area that can ignite fuel!

Requirements:
- Fuse 17 OK.
- Fuel filter in perfect condition.
- Battery fully charged (at least 12 volts).
- Fuel pump delivery rate OK.

Procedure:
- Connect remote control VAG 1348/3A as follows:
- Open cover of fuse panel on left side of instrument panel.




- Remove fuse 17 from holder.
- Connect VAG 1348/3A remote control to fuse 17 sockets -2- using VAG 1348/32 adapter and adapter cables from VW 1594 connector test kit.
- Connect clip terminal clamp to starting aid socket (+).




- Connect pressure gauge VAG 1318 between fuel supply line and fuel rail.

CAUTION: Pressure tester valve must be in "open" position.

- Operate remote control switch for approx. 30 seconds.
- Move lever on pressure tester to "closed" position.

CAUTION: The lever on the pressure tester must remain in the closed position during the test.

- Briefly operate remote control switch until max. pressure of 5.5 bar (80 psi) is indicated.
- Observe pressure drop on gauge.

Specification: After 10 minutes, max. pressure drop is 0.5 bar (7 psi).

If pressure drops below specified value:
- Check pressure tester connections for leaks.
- Check all fuel line connections for tightness and leakage.

If no leaks are present, fuel pump check valve is defective.
- Replace fuel pump.