GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 2WD 🢒 Engine 🢒 Engine Controls and Fuel - 6.6L 🢒 Fuel Injection Fuel Rail Assembly Replacement - Bank 1

Removal Procedure

    Object Number: 1872490 Size: SH
  1. Remove the heater outlet pipe. Refer to Heater Outlet Hose Replacement .
  2. Remove the fuel filter assembly. Refer to Fuel Filter Assembly Replacement .
  3. Remove the turbocharger coolant outlet pipe. Refer to Turbocharger Coolant Hoses/Pipes Replacement .
  4. Disconnect the engine wiring harness electrical connector (1) from the fuel injection fuel rail fuel pressure sensor wiring harness extension.
  5. Remove the fuel injection fuel rail fuel pressure sensor wiring harness extension clip (3) from the wiring harness bracket.
  6. Remove the wiring harness bracket bolts and bracket (2).

    7. Object Number: 1335614 Size: SH
  7. Prior to removing the fuel injection fuel feed pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean of debris.
  8. Spray lithium grease, GM P/N 12346293 or equivalent, between the fuel injector line and fittings to assist in containing any debris during removal.

    9. Notice: DO NOT use compressed air to clean debris from the fuel injector inlet after the fuel line is removed. Using compressed air can allow debris to enter the fuel injector inlet and damage the fuel injector.

  9. Remove the fuel injection fuel feed pipes.

    10. Object Number: 1872372 Size: SH
  10. Loosen the right fuel rail fuel feed pipe fitting (4) at the fuel rail.

    11. Object Number: 1872721 Size: SH
  11. Remove the fuel injection fuel rail bolts.
  12. Remove the fuel rail.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1872721 Size: SH
  1. Position the fuel injection fuel rail to the intake manifold.
  2. Install the fuel injection fuel rail bolts.

    3. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1872372 Size: SH
  3. Tighten the right fuel rail fuel feed pipe fitting (4) at the fuel rail.

    4. Tighten
    Tighten the fittings to 41 N·m (30 lb ft).


    Object Number: 1335614 Size: SH

    Notice: Ensure proper torquing of the fuel injector line. An under-torqued fuel injector line will not seal properly and an over-torqued fuel injector line may damage the fuel injector fitting. An improperly sealed or damaged fuel injector line or fuel injector fitting will cause a fuel leak.

  4. Install the fuel injector pipes.

    5. Tighten
    Tighten the fittings to 41 N·m (30 lb ft).


    Object Number: 1872490 Size: SH
  5. Position the wiring harness bracket (2) and install the bolts.

    6. Tighten
    Tighten the bolts to 24 N·m (18 lb ft).

  6. Connect the engine wiring harness electrical connector (1) to the fuel injection fuel rail fuel pressure sensor wiring harness extension.
  7. Install the fuel injection fuel rail fuel pressure sensor wiring harness extension clip (3) to the wiring harness bracket.
  8. Install the turbocharger coolant outlet pipe. Refer to Turbocharger Coolant Hoses/Pipes Replacement .
  9. Install the fuel filter assembly. Refer to Fuel Filter Assembly Replacement .
  10. Install the heater outlet pipe. Refer to Heater Outlet Hose Replacement .
  11. Prime the fuel system. Refer to Fuel System Priming .
  12. Start the engine. If the engine stalls, repeat the above step.
  13. Once the engine starts, inspect for fuel leaks.