Leak testing

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.

Add approx. 3 liters (3/4 gal.) of fuel and let engine run for 10 min. Stop engine and let vehicle stand for approx. 6 hours.
If the engine starts without a problem after 6 hours and runs for 10 minutes without problems, the integrated reservoir is leak-tight.