GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Generic 🢒 2008 🢒 Unit Repair 🢒 Engine 🢒 Engine Controls and Fuel - LS Engines 🢒 Fuel Injector Replacement

Removal Procedure

    Important: 

       • Use care in removing the fuel injectors to prevent damage to the electrical connector pins on the injector and to prevent damage to the nozzle. Service the fuel injector as a complete assembly only. The fuel injector is an electrical component. Do Not immerse the fuel injector in any type of cleaner.
       • The engine oil may be contaminated with fuel if the fuel injectors are leaking.

  1. Remove the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement.

    2. Object Number: 12772 Size: SH
  2. Spread the injector retainer clip to release the injector from the fuel rail.
  3. Remove the fuel injector.
  4. Discard the injector retainer clip.
  5. Remove the injector O-ring seals from both ends of the injector. Discard the O-ring seals. Save the O-ring backup for use in reinstallation.

Installation Procedure
Object Number: 12639 Size: SH

Important: 

   • When ordering new fuel injectors, be sure to order the correct injector for the application being serviced.
   • The fuel injector lower O-ring uses a nylon collar, called the O-ring backup, to properly position the O-ring on the injector. Always reinstall the O-ring backup, or the sealing O-ring may move on the injector when installing the fuel rail and result in a possible vacuum leak.

The fuel injector assembly (1) is stamped with a part number identification (2) and a build date code (3). The build date code consists of the month (4) 1-9 (Jan-Sept) O, N, D, (Oct, Nov, Dec); day (5); and year (6).


    Object Number: 12642 Size: SH
  1. Lubricate the new injector O-ring seals with clean engine oil.
  2. Install the new injector O-ring seals on the injector.
  3. Install a new retainer clip on the injector. Position the clip on the right side of the injector electrical connector.
  4. 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.

    5. Object Number: 12609 Size: SH
  5. Install the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement.
  6. Connect the negative battery cable.
  7. Inspect for leaks by performing the following:
    8. 7.1. Ignition ON for 2 seconds.
    7.2. Ignition OFF for 10 seconds.
    7.3. Ignition ON, inspect for fuel leaks.