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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Controls - 6.6L - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Pressure Regulator Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: If the pressure regulator is being reused, check the O-rings for damage. If the O-rings are damaged, install NEW O-rings.
  1. Lubricate and install NEW O-rings onto the regulator. Lubricate the O-rings with clean, NEW engine oil.
    IMPORTANT: If the regulator is installed at an angle the O-rings may be damaged, resulting in possible fuel leakage.
  2. Install the fuel pressure regulator (1).
    Fig 1: Installing Fuel Pressure Regulator
    GM901301Courtesy of GENERAL MOTORS CORP.
    3. NOTE: Refer to Fastener Notice .
    Fig 2: Installing Fuel Pressure Regulator Screws
    GM901300Courtesy of GENERAL MOTORS CORP.
  3. Install the 3 fuel pressure regulator screws (1) using a T25 TORX®.

    Tighten: 

    • Tighten the screws a first pass to 4 N.m (35 lb in).
    • Tighten the screws a final pass to 7 N.m (62 lb in).

  4. Install the distribution block hoses to the distribution block.
    Fig 3: View Of Fuel Hose Connections
    GM1335595Courtesy of GENERAL MOTORS CORP.
  5. Position the distribution block hose clamps.
    6. Fig 4: View Of Oil Level Sensor Electrical Harness Connector
    GM1335526Courtesy of GENERAL MOTORS CORP.
  6. Connect the oil level sensor harness electrical connector.
    7. Fig 5: Connecting Fuel Pressure Regulator Electrical Connector
    GM786996Courtesy of GENERAL MOTORS CORP.
  7. Connect the fuel pressure regulator electrical connector (1).
    8. Fig 6: View Of Fuel Temperature Sensor Electrical Connector
    GM1335528Courtesy of GENERAL MOTORS CORP.
  8. Connect the fuel temperature sensor electrical connector.
  9. Install the water outlet tube. Refer to Water Outlet Tube Replacement (6.6L (LLY) Engine) .
  10. Connect the ECT sensor electrical connector.
    Fig 7: View Of Engine Coolant Temperature Sensor And Electrical Connector
    GM1335413Courtesy of GENERAL MOTORS CORP.
    11. Fig 8: View Of Main Engine Electrical Harness Connector Bolts
    GM1334916Courtesy of GENERAL MOTORS CORP.
  11. Install the main connectors to the bracket.
  12. Install the main engine harness electrical connector bolts.

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

  13. Connect the main engine electrical harness connectors.
  14. Push down on the latches (1) in order to connect the connectors.
    Fig 9: View Of Main Engine Electrical Harness Connector Latches & Harness Clip
    GM1409327Courtesy of GENERAL MOTORS CORP.
  15. Close the harness clip (2).
  16. Position the A/C compressor.
  17. Install the A/C compressor bolts.
    Fig 10: View Of A/C Compressor & Bolts
    GM652573Courtesy of GENERAL MOTORS CORP.

    Tighten:  Tighten the bolts to 50 N.m (37 lb ft).

  18. Connect the A/C cut out switch electrical connector.
  19. Connect the A/C compressor clutch electrical connector.
  20. Install the generator. Refer to Generator Replacement (4.8L, 5.3L, and 6.0L Engines) or Generator Replacement (6.6L (LLY) Engine) or Generator Replacement (8.1L Engine) .
  21. Install the air intake pipe. Refer to Air Intake Pipe Replacement .
  22. Prime the fuel system. Refer to Fuel System Priming .
  23. Start the engine. If the engine stalls, repeat the above step.
  24. Once the engine starts, inspect for fuel leaks.
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