GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Denali 🢒 Engine 🢒 Engine Controls and Fuel - 6.6L (LMM) 🢒 Fuel Injection Fuel Rail Assembly Replacement - Bank 2

Removal Procedure

    Object Number: 1378748 Size: SH
  1. Remove the fuel line bracket nut.
  2. Remove the fuel line bracket from the stud.
  3. Remove the charge air cooler inlet pipe. Refer to Charge Air Cooler Inlet Pipe Replacement .
  4. Remove the positive crankcase ventilation (PCV) hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .
  5. Remove the right fuel rail fuel feed pipe. Refer to Fuel Rail Fuel Feed Pipe Replacement - Right Side .
  6. Remove the fuel return pipe. Refer to Fuel Return Pipe Replacement .

    7. Object Number: 1872505 Size: SH
  7. Remove the fuel pipe bracket bolt (4) and bracket (3).

    8. Object Number: 1387871 Size: SH
  8. Loosen the left fuel rail fuel feed pipe fittings (1).

    9. Object Number: 1335603 Size: SH
  9. Remove the left fuel rail fuel feed pipe.

    10. Object Number: 1335608 Size: SH
  10. Prior to removing the fuel injector pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean of debris.
  11. Spray lithium grease, GM P/N 12346293 or equivalent, between the fuel injector line and fittings to assist in containing any debris during removal.

    12. 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.

  12. Remove the left fuel injection fuel feed pipes.

    13. Object Number: 1335616 Size: SH
  13. Remove the fuel injection fuel rail bolts.
  14. Remove the fuel injection fuel rail and bracket.
  15. Reposition the fuel hose clamp at the rail and remove the fuel hose, if required.

Installation Procedure

    Object Number: 1335616 Size: SH
  1. Install the fuel hose to the fuel injection fuel rail and position the clamp, if required.
  2. Position the fuel injection fuel rail and bracket to the left intake manifold.

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

  3. Install the fuel injection fuel rail bolts.

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


    Object Number: 1335608 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. Position the fuel injection fuel feed pipes.

    5. Object Number: 1387871 Size: SH
  5. Tighten the left fuel rail fuel feed pipe fittings (1).

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


    Object Number: 1872505 Size: SH
  6. Position the fuel pipe bracket (3) and install the bolt (4).

    7. Tighten
    Tighten the bolt to 24 N·m (18 lb ft).


    Object Number: 1378748 Size: SH
  7. Install the fuel return pipe. Refer to Fuel Return Pipe Replacement .
  8. Install the right fuel rail fuel feed pipe. Refer to Fuel Rail Fuel Feed Pipe Replacement - Right Side .
  9. Install the PCV hose/pipe. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .
  10. Install the charge air cooler inlet pipe. Refer to Charge Air Cooler Inlet Pipe Replacement .
  11. Install the fuel line bracket to the stud.
  12. Install the fuel line bracket nut.

    13. Tighten
    Tighten the nut to 16 N·m (12 lb ft).

  13. Prime the fuel system. Refer to Fuel System Priming .
  14. Start the engine. If the engine stalls, repeat the above step.
  15. Once the engine starts, inspect for fuel leaks.