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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 976 (Engine Controls - 6.6L (Lb7) (Introduction)) >> Repair Instructions >> Fuel Injector Feed Pipes Replacement - Left >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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. Fig 1: View Of Upper Intake Manifold Cover, Outlet Duct & Clamp
    GM813243Courtesy of GENERAL MOTORS CORP.
  4. Drain the cooling system. Refer to Draining and Filling Cooling System (with HP2) or Draining and Filling Cooling System (without HP2) in Engine Cooling.
  5. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  6. Loosen the charged air cooler inlet duct to turbocharger clamp (1).
    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. Fig 2: View Of Charged Air Cooler Inlet Duct & Clamps
    GM877281Courtesy of GENERAL MOTORS CORP.
  7. Remove the charged air cooler inlet duct from the turbocharger.
  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. Fig 3: View Of Upper Engine
    GM666693Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the fuel lines from the chassis pipes. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  14. Remove the fuel hose bracket nut from the upper valve rocker arm cover.
    15. Fig 4: View Of Fuel Hose Bracket & Nut
    GM674616Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the engine wiring harness connectors. Lift up on the latch in order to disconnect the connectors.
    16. Fig 5: View Of Main Engine Harness Electrical Connectors
    GM674653Courtesy of GENERAL MOTORS CORP.
  16. Remove the engine wiring harness bulk electrical connectors bolts (1).
  17. Remove the engine wiring harness bracket bolts (2).
    18. Fig 6: View Of Engine-To-Chassis Harness Connector & Bracket Bolts
    GM674680Courtesy of GENERAL MOTORS CORP.
  18. Remove the water outlet tube. Refer to Water Outlet Tube Replacement (6.6L (LB7) Engine) or Water Outlet Tube Replacement (6.6L (LLY) Engine) in Engine Cooling.
  19. Remove the glow plug relay bracket. Refer to Glow Plug Relay Replacement (Federal Emissions)  or Glow Plug Relay Replacement (California Emissions) .
  20. Remove the auxiliary generator, if equipped. Refer to Generator Replacement - Auxiliary (6.6L (LB7) Engine) or Generator Replacement - Auxiliary (6.6L (LLY) Engine) in Engine Electrical.
  21. Reposition the positive crankcase ventilation (PCV) hose clamp.
  22. Disconnect the PCV hose from the upper valve rocker arm cover.
    23. Fig 7: View Of Crankcase Ventilation Hoses At Valve Rocker Arm Covers
    GM687021Courtesy of GENERAL MOTORS CORP.
  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. Fig 8: View Of Fuel Injector Line Fittings
    GM1336209Courtesy of GENERAL MOTORS CORP.
  25. Remove the fuel injector feed pipe retainer bolts and retainers.
    26. NOTE: 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.
    27. Fig 9: Left Fuel Injector Feed Pipes
    GM660451Courtesy of GENERAL MOTORS CORP.
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