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Home >> Chevrolet >> 2005 >> Avalanche 2500 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 8.1L - Introduction >> Repair Instructions >> Fuel Rail Assembly Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: View Of Fuel Injector, Clip & O-Rings
    GM351185Courtesy of GENERAL MOTORS CORP.
  1. Lubricate NEW lower injector O-ring seals (4) with clean engine oil.
  2. Install the NEW O-ring seals (4) onto the spray tip end of each injector (3).
    3. Fig 2: View Of Fuel Injection Rail
    GM1198692Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to the Fastener Notice in Cautions and Notices.
  3. Install the fuel rail.
  4. Install the fuel rail studs.

    Tighten:  Tighten the studs to 12 N.m (106 lb in).

    5. Fig 3: View Of Fuel Feed Pipe & EVAP Canister Purge Pipe
    GM1238587Courtesy of GENERAL MOTORS CORP.
  5. Connect the fuel feed (1) line to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  6. Connect the fuel injector electrical connectors.
    • Install each connector onto the proper injector in order to ensure correct sequential injector firing order.
    • Rotate the injectors as required in order to avoid stretching the wire harness.
    7. Fig 4: View Of Generator, Injector Harness, Ignition Coil Harness, ETC & Purge Valve Solenoid Electrical Connectors
    GM1235689Courtesy of GENERAL MOTORS CORP.
  7. Reposition the engine harness.
  8. Install the engine harness bolt and studs.

    Tighten:  Tighten the bolt/studs to 10 N.m (89 lb in).

  9. Connect the ETC electrical connector (5).
  10. Connect the EVAP canister purge valve electrical connector.
  11. Connect the generator electrical connector (2).
  12. Install the engine sight shield. Refer to Engine Sight Shield Replacement in Engine Mechanical - 8.1L.
  13. Install the fuel fill cap.
  14. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  15. Use the following procedure to inspect for leaks:
    1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    2. Turn the ignition OFF for 10 seconds.
    3. Turn the ignition ON, with the engine OFF.
    4. Inspect for fuel leaks.
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