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Home › Cadillac › 2004 › CTS Base, 3.2 N › Repair and Diagnosis › Engine Performance › System › Engine Controls - 2.6L & 3.2L - Introduction › Repair Instructions › Fuel Injectors and Fuel Rail Replacement › Installation Procedure

Installation Procedure

    NOTE:
    • Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination.
    • Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components.
    • Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.
  1. Lubricate the new fuel injector O-ring seals with clean engine oil.
  2. Install the new fuel injector O-ring seals on to the fuel injectors.
  3. Install the fuel injectors to the fuel rail with the new retainer clips.
  4. Ensure that the injectors are aligned by orienting the electrical connectors perpendicular to the crankshaft centerline.
    5. Fig 1: Aligning Fuel Injectors & Fuel Rail To Intake Manifold
    GM818892Courtesy of GENERAL MOTORS CORP.
  5. Align the fuel injectors and fuel rail to the intake manifold.
  6. Carefully press the fuel rail assembly downward until fully seated against the intake manifold.
  7. Install the fuel rail with the injectors to the intake manifold.
    8. Fig 2: Locating Fuel Rail To Intake Manifold Retaining Bolts
    GM818891Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Install the bolts securing the fuel rail to the intake manifold.

    Tighten:  Tighten the fuel rail bolts to 8 N.m (71 lb in).

  9. Connect the atmospheric vent hose to the fuel pressure regulator.
  10. Clip the fuel injector electrical harness to the fuel rail.
  11. Connect the fuel injector electrical connectors to each fuel injector.
    12. Fig 3: Identifying Fuel Rail Brace Bolt
    GM818890Courtesy of GENERAL MOTORS CORP.
  12. Install the fuel rail brace bolt to the intake manifold.

    Tighten:  Tighten the fuel rail brace bolt to 8 N.m (71 lb in).

    13. Fig 4: View Of Chassis Hose/Pipes Retainer
    GM785815Courtesy of GENERAL MOTORS CORP.
  13. Refer to Quick Connect Fitting(s) Service (Metal Collar)  in order to connect the following quick connect fittings to the fuel rail:
    • The feed hose/pipe (2)
    • The return hose/pipe (1)
  14. Install the intake plenum. Refer to Intake Plenum Replacement in Engine Mechanical-2.6L and 3.2L.
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