Fuel Pressure Release
WARNING: This page is about a different car, the 1995 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
Remove fuel pump relay. Start engine. Allow engine to run until it stalls. 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. Reinstall fuel pump relay.