GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 6.6L (LB7) 🢒 Fuel Injection Fuel Feed Pipe Replacement - Left Side

Removal Procedure

    Object Number: 813243 Size: SH
  1. Loosen the outlet duct clamp at the upper intake manifold cover.
  2. Remove the upper intake manifold cover from the outlet duct.
  3. Remove the upper intake manifold cover.
  4. Drain the cooling system. Refer to Cooling System Draining and Filling .
  5. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .

    6. Object Number: 877281 Size: SH
  6. Loosen the charged air cooler inlet duct to turbocharger clamp (1).

    7. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damaged. Loosen the hose by twisting.

  7. Remove the charged air cooler inlet duct from the turbocharger.

    8. Object Number: 666693 Size: SH
  8. Remove the battery cable to generator nut.
  9. If equipped, remove the battery cable to auxiliary generator nut.
  10. Remove the battery cable harness clip from the bracket.
  11. Remove the battery cable junction block bolt from the power steering pump.
  12. Move and secure the battery cables out of the way.

    13. Object Number: 674616 Size: SH
  13. Disconnect the fuel lines from the chassis pipes. Refer to Metal Collar Quick Connect Fitting Service .
  14. Remove the fuel hose bracket nut from the upper valve rocker arm cover.

    15. Object Number: 674653 Size: SH
  15. Disconnect the engine wiring harness connectors.

    16. Lift up on the latch in order to disconnect the connectors.


    Object Number: 674680 Size: SH
  16. Remove the engine wiring harness bulk electrical connectors bolts (1).
  17. Remove the engine wiring harness bracket bolts (2).
  18. Remove the water outlet tube. Refer to Water Outlet Tube Replacement .
  19. Remove the glow plug relay bracket. Refer to Glow Plug Relay Replacement .
  20. Remove the auxiliary generator, if equipped. Refer to Auxiliary Generator Replacement .

    21. Object Number: 687021 Size: SH
  21. Reposition the positive crankcase ventilation (PCV) hose clamp.
  22. Disconnect the PCV hose from the upper valve rocker arm cover.

    23. Object Number: 1336209 Size: SH
  23. Before removing the fuel injector lines, use compressed air to blow any debris from between the injector line and fittings (1, 2). Wipe the fittings clean of debris.
  24. Spray lithium grease, GM P/N 12346293 or equivalent, between the fuel injector line and fittings (1, 2) to assist in containing any debris during removal.

    25. Object Number: 660451 Size: SH
  25. Remove the fuel injector feed pipe retainer bolts and retainers.

    26. 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.

  26. Remove fuel injector feed pipes.

Installation Procedure

    Object Number: 660451 Size: SH
  1. Install fuel injector feed pipes.

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


    Object Number: 1336209 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.

  2. Tighten the fuel injector feed pipe fittings (1, 2).

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

  3. Install the fuel injector feed pipe retainers and bolts.

    4. Tighten
    Tighten the screws to 4 N·m (35 lb in).


    Object Number: 687021 Size: SH
  4. Install the PCV hose to the upper valve rocker arm cover.
  5. Position the PCV hose clamp.

    6. Object Number: 674680 Size: SH
  6. Install the engine wiring harness bracket bolts (2).

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

  7. Install the engine wiring harness bulk electrical connector bolts (1).

    8. Tighten
    Tighten the bolts to 21 N·m (15 lb ft).


    Object Number: 674653 Size: SH
  8. Connect the engine wiring harness bulk electrical connectors.
  9. Install the water outlet tube. Refer to Water Outlet Tube Replacement .
  10. Install the glow plug relay bracket. Refer to Glow Plug Relay Replacement .
  11. Install the auxiliary generator, if equipped. Refer to Auxiliary Generator Replacement .

    12. Object Number: 674616 Size: SH
  12. Connect the fuel lines to the chassis pipes. Refer to Metal Collar Quick Connect Fitting Service .
  13. Install the fuel hose bracket nut to the valve rocker arm cover.

    14. Tighten
    Tighten the nut to 21 N·m (15 lb ft).


    Object Number: 666693 Size: SH
  14. Position the generator positive cable.
  15. Install the generator positive cable in the clip on the engine front cover.
  16. Install the generator positive cable and nut to the generator.

    17. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  17. Install the battery positive cable junction block bracket and bolt to the power steering pump.

    18. Tighten
    Tighten the bolt to 9 N·m (80 lb in).


    Object Number: 877281 Size: SH
  18. Install the charged air cooler inlet duct to the turbocharger.
  19. Align the mark on the duct (2) with the mark on the turbocharger.
  20. Position the clamp (1) as shown for proper clearance.

    21. Tighten
    Tighten the clamp to 6 N·m (53 lb in).

  21. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  22. Fill the cooling system. Refer to Cooling System Draining and Filling .

    23. Object Number: 813243 Size: SH
  23. Install the upper intake manifold cover.
  24. Install the upper intake manifold cover to the outlet duct.
  25. Tighten the outlet duct clamp at the upper intake manifold cover.

    26. Tighten
    Tighten the clamp to 6 N·m (53 lb in).