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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 Pressure Regulator Replacement >> 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. Remove the air intake pipe. Refer to Air Intake Pipe Replacement .
  2. Disconnect the air conditioning (A/C) compressor clutch electrical connector.
  3. Disconnect the A/C cut out switch electrical connector.
  4. Remove the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 6.6L.
  5. Remove the A/C compressor bolts.
    6. Fig 1: View Of A/C Compressor & Bolts
    GM652573Courtesy of GENERAL MOTORS CORP.
  6. Move the A/C compressor with the hoses attached to the right side of the engine compartment.
  7. 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.
  8. Disconnect both main harness electrical connectors.
    9. Fig 2: View Of Main Engine Harness Electrical Connectors
    GM674653Courtesy of GENERAL MOTORS CORP.
  9. Remove both main harness electrical connector to bracket bolts (1).
    10. Fig 3: View Of Engine-To-Chassis Harness Connector & Bracket Bolts
    GM674680Courtesy of GENERAL MOTORS CORP.
  10. Remove the main harnesses from the bracket.
  11. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1).
    12. Fig 4: ECT Sensor Electrical Connector
    GM740506Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the barometric pressure (BARO) sensor electrical connector (1)
    13. Fig 5: BARO Sensor Electrical Connector
    GM739503Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the glow plug relay electrical connectors (1, 2, 3).
    14. Fig 6: Glow Plug Relay Electrical Connectors
    GM786978Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the fuel rail temperature sensor electrical connector (1).
    15. Fig 7: Fuel Rail Temperature Sensor Electrical Connector
    GM786977Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the left front fuel injector electrical connector (1).
    16. Fig 8: Left Front Fuel Injector Electrical Connector
    GM786986Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the left rear fuel injector electrical connector (1).
    17. Fig 9: Left Rear Fuel Injector Electrical Connector
    GM786988Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the fuel pressure regulator electrical connector (1).
    18. Fig 10: Fuel Pressure Regulator Electrical Connector
    GM786996Courtesy of GENERAL MOTORS CORP.
  18. Disconnect the oil level sensor harness electrical connector (1).
    19. Fig 11: Oil Level Electrical Connector
    GM788846Courtesy of GENERAL MOTORS CORP.
  19. Remove the positive crankcase ventilation (PCV) hose from both valve covers.
    20. Fig 12: View Of Crankcase Ventilation Hoses At Valve Rocker Arm Covers
    GM687021Courtesy of GENERAL MOTORS CORP.
  20. Reposition the injection pump inlet clamp.
  21. Remove the injection pump inlet hose from the fuel feed distribution (leak-off) block. Reposition the hose.
    22. Fig 13: Injection Pump Inlet Hose At Fuel Feed Distribution Block
    GM901298Courtesy of GENERAL MOTORS CORP.
  22. Clean the fuel pressure regulator and high pressure injection pump thoroughly with solvent, such as GM P/N 12377981 (Canadian P/N 10953463) or equivalent.
  23. Using compressed air, thoroughly blow dry the regulator and pump.
  24. Remove the 3 fuel pressure regulator screws (1) using a T25 TORX®.
    25. Fig 14: Fuel Pressure Regulator Screws
    GM901300Courtesy of GENERAL MOTORS CORP.
  25. Remove the fuel pressure regulator (1).
    26. Fig 15: Fuel Pressure Regulator
    GM901301Courtesy of GENERAL MOTORS CORP.
  26. If dirt or debris is found in the bore or seating surfaces of the fuel injection pump, perform the following:
    • Place a clean rag over the bore on order to collect the excess fuel.
    • Bump the engine over in order to flush any debris out of the regulator bore.
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