Fuel pump check valve, checking: Checking
WARNING: This page is about a different car, the 1999 Audi A8, 1998 Audi A8, and 1997 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect fuel supply line at fuel rail.
- Install pressure gauge VAG 1318 with adapter between fuel supply line and fuel rail.
- Connect remote control VAG 1348/3A. See FUEL PUMP, CHECKING .
- Press and hold remote control switch for approx. 30 seconds.
- Close valve on pressure gauge.
- Observe drop in pressure for 10 minutes.
Maximum pressure drop (after 10 minutes): 0.5 bar (7 psi)
If pressure drop is not OK:
- Check pressure gauge connectors for leaks.
- Check fuel lines for leaks.
If there are no leaks:
- Replace fuel pump and integrated reservoir. See FUEL PUMP WITH INTEGRATED RESERVOIR, REMOVING AND INSTALLING .