Fuel Pressure Release
WARNING: This page is about a different car, the 1993 Audi 90 and 1993 Audi 100. However, it is still accessible from the selected car via links, so may be relevant.
Remove fuel pump relay. See ELECTRICAL COMPONENT LOCATIONS table. Start engine. Allow engine to run until it stops. Turn ignition off. Disconnect negative battery cable. Slight pressure may remain in system. Before disconnecting any fuel system line, cover connector with a clean shop towel. Install fuel pump relay.