GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 1625417  Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  3. Disconnect the fuel feed line quick connect fitting from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .

  4. Object Number: 1623766  Size: SH
  5. Disconnect the evaporative emission (EVAP) purge tube from the intake manifold. Refer to Metal Collar Quick Connect Fitting Service .

  6. Object Number: 1623764  Size: SH
  7. Disconnect the fuel injector harness electrical connector (2).
  8. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.

  9. Object Number: 1623549  Size: SH
  10. Remove the fuel injector harness electrical connector clips (4 and 5) from the intake manifold.

  11. Object Number: 1578472  Size: SH
  12. Remove the fuel rail studs.
  13. Important: Use care when removing the fuel rail assembly in order to prevent damage to the fuel injectors electrical connector terminals and spray tips.

  14. Pull the fuel rail back and upward in order to release the fuel injectors from the cylinder head ports.
  15. Remove the fuel rail.
  16. Remove the fuel injectors, if necessary. Refer to Fuel Injector Replacement .

Installation Procedure

Important: Install new lower O-rings when reusing fuel injectors. Lubricate the injector tip O-rings prior to installing the injectors into the intake manifold.


    Object Number: 1578472  Size: SH
  1. Install the fuel injectors, if necessary. Refer to Fuel Injector Replacement .
  2. With the fuel injectors positioned downward, lower the fuel injectors into the cylinder head ports.
  3. Carefully push the fuel injectors into the cylinder head ports.
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the fuel rail bolts.
  6. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1623764  Size: SH
  7. Connect the fuel injector harness electrical connector (2).
  8. Connect the MAP sensor electrical connector.

  9. Object Number: 1623549  Size: SH
  10. Install the fuel injector harness electrical connector clips (4 and 5) to the intake manifold.

  11. Object Number: 1623766  Size: SH
  12. Connect the EVAP purge tube to the intake manifold. Refer to Metal Collar Quick Connect Fitting Service .

  13. Object Number: 1625417  Size: SH
  14. Connect the fuel feed line quick connect fitting to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  15. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  16. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  17. Inspect for fuel leaks using the following procedure:
  18. 12.1. Turn ON the ignition, with the engine OFF for 2 seconds.
    12.2. Turn OFF the ignition for 10 seconds.
    12.3. Turn ON the ignition.
    12.4. Inspect for fuel leaks.