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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1026 (Engine Controls And Fuel - 6.6L - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Pressure Regulator Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Engine Coolant Temperature Sensor Connectors
    GM1870783Courtesy of GENERAL MOTORS CORP.
  1. Remove the generator. Refer to Generator Replacement (6.6L) .
  2. Remove the intake manifold tube. Refer to Intake Manifold Tube Replacement .
  3. Remove the water outlet tube. Refer to Water Outlet Tube Replacement (LMM) .
  4. Unbolt and reposition the air conditioning (A/C) compressor (with the hoses attached) to the right side of the engine compartment. Refer to Air Conditioning Compressor Replacement (LLY/LMM) .
  5. Disconnect the engine coolant temperature (ECT) sensor electrical connectors (1) and reposition the harness branches.
    6. Fig 2: View Of Wiring Harness Extension Electrical Connector
    GM1872933Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the wiring harness extension electrical connector (1) from the fuel pressure regulator.
    7. Fig 3: View Of Fuel Hose Clamps
    GM1872010Courtesy of GENERAL MOTORS CORP.
  7. Reposition the fuel hose clamp (2) at the fuel injection fuel feed manifold.
    8. Fig 4: View Of Fuel Filter Hoses & Clamps
    GM1872011Courtesy of GENERAL MOTORS CORP.
  8. Reposition the fuel hose clamp (3) at the fuel injection pump.
  9. Remove the fuel hose (4) from the fuel injection fuel feed manifold and injection pump.
    10. Fig 5: Exploded View Of Fuel Pressure Regulator & Screws Location
    GM1872934Courtesy of GENERAL MOTORS CORP.
  10. 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.
  11. Using compressed air, thoroughly blow dry the regulator and pump.
  12. Remove the 3 fuel pressure regulator screws (1) using a T25 TORX®.
  13. Remove the fuel pressure regulator (2).
  14. 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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