Test fuel cap
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.
- Connect fuel cap tester to hose.
- Screw fuel cap tightly to cap receiver (arrow).
- Turn control valve to "Test".
- Read flow meter on tester.
If no flow is indicated:
- Proceed to "Test LDP for internal leaks".
If flow is indicated:
- Replace fuel cap and re-test.
If new fuel cap shows no flow:
- Repeat Leak Test, with new fuel cap installed, using VAS 5051 and Basic Settings mode.
If Leak Test shows "System OK":
- Perform quality check and return vehicle to customer.