GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 SLS 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Fuel Injector and Fuel Rail Replacement

Removal Procedure

    Notice: 

       • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
       • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.

  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Remove the cross vehicle brace. Refer to Cross Vehicle Brace Replacement .
  3. Clean the fuel rail assembly with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.

    4. Object Number: 1234881 Size: SH
  4. Disconnect the fuel feed hose/pipe (1) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .

    5. Object Number: 928153 Size: SH
  5. Remove the positive crankcase ventilation (PCV) dirty air hose.

    6. Object Number: 1239219 Size: SH
  6. Disconnect the evaporative emission (EVAP) quick connect fitting (2). Refer to Plastic Collar Quick Connect Fitting Service .

    7. Object Number: 1235105 Size: SH
  7. Open the retainers (1 and 2) located at the right side rear of the engine and the front of dash. Position the lines aside.

    8. Object Number: 887913 Size: SH
  8. Disconnect the left side fuel injector wiring harness connectors (1) from the fuel injectors (2).

    9. Object Number: 887914 Size: SH
  9. Disconnect the right side fuel injector wiring harness connectors (1) from the fuel injectors (2).

    10. Object Number: 928160 Size: SH
  10. Remove the fuel injector sight shield bracket.

    11. Object Number: 1277261 Size: SH
  11. Remove the fuel rail attaching studs.
  12. Remove the fuel rail assembly.
  13. Remove the injector lower O-ring seal from the spray tip end of each injector.
  14. Discard the O-ring seals.
  15. Remove the retainers from the fuel injectors.
  16. Remove the fuel injectors from the fuel rail.
  17. Remove the O-ring seals from the fuel injectors. Discard the O-ring seals.

Installation Procedure

    Notice: 

       • 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.


    Object Number: 1277261 Size: SH
  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 using new retainer clips.
  4. Ensure that the injectors are aligned by orientating the electrical connectors perpendicular to the crankshaft centerline.
  5. Lubricate and install the new O-ring seals on the spray tip end of each injector.
  6. Align the fuel injectors and fuel rail to the intake manifold.
  7. Carefully press the fuel rail assembly downward until fully seated against the intake manifold.

    8. Notice: Refer to Fastener Notice in the Preface section.

  8. Install the fuel rail attaching studs.

    9. Tighten
    Tighten the studs to 10 N·m (89 lb in).


    Object Number: 928160 Size: SH
  9. Install the fuel injector sight shield bracket nuts.

    10. Tighten
    Tighten the nuts to 10 N·m (89 lb in).


    Object Number: 887914 Size: SH
  10. Connect the right side fuel injector electrical connectors (1) to each fuel injector (2).

    11. Object Number: 887913 Size: SH
  11. Connect the left side fuel injector electrical connectors (1) to each fuel injector (2).

    12. Object Number: 1235105 Size: SH
  12. Install the fuel feed and EVAP lines to the retaining clips (1 and 2) at the right side rear of the engine and at the front of dash.

    13. Object Number: 1239219 Size: SH
  13. Install the EVAP quick connect fitting (2) to the purge valve. Refer to Plastic Collar Quick Connect Fitting Service .

    14. Object Number: 928153 Size: SH
  14. Install the positive crankcase ventilation (PCV) dirty air hose.

    15. Object Number: 1234881 Size: SH
  15. Connect the fuel feed hose/pipe to the fuel rail (1). Refer to Metal Collar Quick Connect Fitting Service .
  16. Install the cross vehicle brace. Refer to Cross Vehicle Brace Replacement .
  17. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  18. Inspect for fuel leaks using the following procedure:
    19. 18.1. Turn ON the ignition, with the engine OFF for 2 seconds.
    18.2. Turn OFF the ignition for 10 seconds.
    18.3. Turn ON the ignition, with the engine OFF.
    18.4. Inspect for fuel leaks.
  19. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .