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Home >> GMC >> 2005 >> Sierra 2500 HD, 2D Pickup, 6.6 2, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.6L (Introduction) >> Repair Instructions >> Fuel Pressure Regulator Replacement >> Removal Procedure

Removal Procedure

    Fig 1: View Of A/C Compressor & Bolts
    GM652573Courtesy of GENERAL MOTORS CORP.
  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 A/C compressor bolts.
  5. Remove the generator. Refer to Generator Replacement (4.3L Engine) or Generator Replacement (4.8L, 5.3L, and 6.0L Engines) or Generator Replacement (6.6L (LLY) Engine) or Generator Replacement (8.1L Engine) in Engine Electrical.
  6. Reposition the A/C compressor (with the hoses attached) to the right side of the engine compartment.
    7. Fig 2: View Of Main Engine Electrical Harness Connector Latches & Harness Clip
    GM1409327Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the main engine electrical harness connectors. Lift up on the latches (1) in order to disconnect the connectors.
  8. Open the harness clip (2).
  9. Remove the main engine electrical harness connectors.
    10. Fig 3: View Of Barometric Pressure Sensor Electrical Connector
    GM1334921Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the barometric pressure (BARO) sensor electrical connector.
    11. Fig 4: View Of Main Engine Electrical Harness Connector Bolts
    GM1334916Courtesy of GENERAL MOTORS CORP.
  11. Remove the main engine harness electrical connector bolts.
  12. Remove the main connectors from the bracket.
    13. Fig 5: View Of Engine Coolant Temperature Sensor And Electrical Connector
    GM1335413Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
  14. Remove the water outlet tube. Refer to Water Outlet Tube Replacement (6.6L (LLY) Engine) in Engine Cooling.
    15. Fig 6: View Of Fuel Temperature Sensor Electrical Connector
    GM1335528Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the fuel temperature sensor electrical connector.
    16. Fig 7: Fuel Pressure Regulator Electrical Connector
    GM786996Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the fuel pressure regulator electrical connector (1).
    17. Fig 8: View Of Oil Level Sensor Electrical Harness Connector
    GM1335526Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the oil level sensor harness electrical connector.
    18. Fig 9: View Of Fuel Hose Connections
    GM1335595Courtesy of GENERAL MOTORS CORP.
  18. Reposition the distribution block hose clamps.
  19. Remove the distribution block hoses from the distribution block.
    20. Fig 10: Fuel Pressure Regulator Screws
    GM901300Courtesy of GENERAL MOTORS CORP.
  20. 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.
  21. Using compressed air, thoroughly blow dry the regulator and pump.
  22. Remove the 3 fuel pressure regulator screws (1) using a T25 TORX®.
    23. Fig 11: Fuel Pressure Regulator
    GM901301Courtesy of GENERAL MOTORS CORP.
  23. Remove the fuel pressure regulator (1).
  24. 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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