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Fuel Rail & Injectors: Installation

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WARNING: 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.
  1. Lubricate the new injector upper "O" ring seal with clean engine oil. Install the new injector "O" ring seal on the injector. Install retainer clip on the injector. Push the fuel injector into the fuel rail injector socket with the electrical connector facing outward. The retainer clip locks on to a flange on the fuel rail injector socket.
  2. Install the fuel rail assembly into the intake manifold. Tilt the rail assembly to install the injectors. Install the fuel rail attaching bolts. Tighten the fuel rail attaching bolt to specification. See TORQUE SPECIFICATIONS .
  3. Connect the engine coolant temperature sensor electrical connector. Install the injector electrical harness to the fuel rail. Connect the fuel injector connectors. Push the slide locks into position. Connect the main injector harness electrical connector. Install the new "O" rings on the fuel feed pipe and fuel return pipe.
  4. Connect the fuel feed pipe at the fuel rail. Tighten the fuel feed pipe nut to specification. Connect the fuel return pipe at the fuel pressure regulator. Tighten the fuel return pipe nut to specification. Install the upper intake manifold. See appropriate article in ENGINES. Connect the negative battery cable.
  5. Perform the following procedure in order to inspect for leaks. Turn ON the ignition for 2 seconds. Turn OFF the ignition for 10 seconds. Turn ON the ignition. Inspect for fuel leaks.
Fig 1: Removing/Installing Fuel Rail Assembly (3.1L & 3.4L)
G00114737Courtesy of GENERAL MOTORS CORP.


WARNING: 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.
  1. The "O" rings must be replaced on all components that are serviced. Lightly oil the fuel injector O-rings with clean motor oil. Place the fuel rail assembly on the intake manifold. Seat the fuel injectors by HAND.
  2. Tighten the fuel rail hold-down bolts to specification. See TORQUE SPECIFICATIONS . Connect the 6 fuel injector electrical connectors. Connect the fuel feed and return pipes to the fuel rail tubes. Connect the vacuum line to the fuel pressure regulator. Install the ignition coil wires.
  3. Tighten the fuel fill cap. Connect the negative battery cable. Perform the following procedure in order to inspect for leaks. Turn ON the ignition for 2 seconds. Turn OFF the ignition for 10 seconds. Turn ON the ignition. Inspect for fuel leaks. Install the fuel injection sight shield.


WARNING: 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.
  1. Lubricate the new injector upper "O" ring seal with clean engine oil. Place the fuel rail assembly on the intake manifold. Seat the fuel injectors by HAND.
  2. Install the fuel rail hold-down nuts. Tighten the fuel rail hold-down nuts to specification. See TORQUE SPECIFICATIONS .
  3. Install the bypass valve actuator. See Figure. Install the rear generator mounting bracket with the evaporative emission canister purge valve attached. See Fig 1. Connect the fuel injector electrical harness clips to the front of fuel rail.
  4. Connect the fuel injector electrical connectors to the fuel injectors. Install the ignition coil wires to the retainer clips on top of supercharger. Connect the vacuum line to the fuel pressure regulator. Connect the fuel feed, and return pipes to the fuel rail tubes.
  5. Tighten the fuel fill cap. Connect the negative battery cable. Turn ON the ignition, for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition. Inspect for fuel leaks. Install fuel sight shield.
Fig 1: Removing/Installing Generator Brace (3.8L - VIN 1)
G00158341Courtesy of GENERAL MOTORS CORP.
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