Installation Procedure

Fig 1: Exploded View Of Fuel Rails & Injector Components

Courtesy of GENERAL MOTORS CORP.

Lubricate the new fuel return pipe O-ring (6) with clean engine oil.
Install the fuel return pipe O-ring (6) on the fuel return pipe (1).
Install the fuel return pipe (1) to the left fuel rail (14).
Install the fuel return pipe retainer (2) and the fuel return pipe attaching screw (3).
Tighten: Tighten the fuel return pipe attaching screw (3) to 5 N.m (44 lb in).

Fig 2: View Of Rear Of Engine Fuel Pipe Connections

Courtesy of GENERAL MOTORS CORP.

Connect the fuel return pipe (2) and the fuel feed pipe (1) to the fuel rail.
Tighten the fuel filler cap.
Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
Use the following procedure in order to inspect for leaks:
1. Turn ON the ignition, with the engine OFF, for 2 seconds.
2. Turn OFF the ignition for 10 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Inspect for fuel leaks.
Install the engine sight shield. Refer to Engine Sight Shield Replacement in Engine Mechanical.
Install the fuel pressure connection cap.