Removal Procedure

CAUTION: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always install the fuel injector O-rings in the proper position. If the upper and lower O-rings are different colors (black and brown), be sure to install the black O-ring in the upper position and the brown O-ring in the lower position on the fuel injector. The O-rings are the same size but are made of different materials.

IMPORTANT: When servicing the fuel rail assembly, precautions must be taken to prevent dirt and other contaminants from entering the fuel passages. It is recommended that the fittings be capped, and the holes be plugged during servicing.

Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
Remove the upper intake manifold. Refer to Intake Manifold Replacement - Upper in Engine Mechanical.

Fig 1: View Of Engine Compartment Fuel Hose/Pipe At Fuel Rail

Courtesy of GENERAL MOTORS CORP.

Disconnect the engine fuel feed pipe (1) at the fuel rail (4). Refer to Quick Connect Fitting(s) Service (Metal Collar) .
Disconnect the main fuel injector harness electrical connector.
Disconnect the coolant temperature sensor and camshaft position sensor electrical connectors
Disconnect the electrical connectors from the fuel injectors.

Fig 2: View Of Fuel Rail Assembly & Retaining Bolts

Courtesy of GENERAL MOTORS CORP.

Remove the fuel rail retaining bolts (2).
Remove the fuel rail assembly (1).
Remove the injector O-ring seal from the spray tip end of each injector.
If removing the fuel injectors from the fuel rail is necessary. Refer to Fuel Injector Replacement .