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Home >> Chevrolet >> 2009 >> Cutaway 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L LMM - Introduction >> Repair Instructions >> Fuel Injector Replacement (Left) >> Installation Procedure

Installation Procedure

  1. Install a NEW copper washer to the fuel injector bore.
  2. Install a NEW fuel injector O-ring to the injector.
  3. Install the fuel injectors with brackets.
    4. Fig 1: View Of Left Fuel Injector Bracket Bolts
    GM1335618Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Fastener Caution .
  4. Install the fuel injector bracket bolts and tighten to 30 N.m (22 lb ft).
    5. Fig 2: View Of Fuel Injector Engine Wiring Harness Electrical Connector
    GM1732433Courtesy of GENERAL MOTORS CORP.
  5. Connect the fuel injector electrical connectors.
    6. Fig 3: View Of Fuel Return Hose At The Fuel Injector
    GM1732415Courtesy of GENERAL MOTORS CORP.
  6. Connect the fuel return hose to the injectors.
    7. Fig 4: Identifying Fuel Return Hose Clip At The Fuel Injector
    GM1732395Courtesy of GENERAL MOTORS CORP.
  7. Install the fuel return hose clips (1).
    8. Fig 5: View Of Left Fuel Injector Pipes
    GM1335608Courtesy of GENERAL MOTORS CORP.
    CAUTION: Ensure proper torquing of the fuel injector line. An under-torqued fuel injector line will not seal properly and an over-torqued fuel injector line may damage the fuel injector fitting. An improperly sealed or damaged fuel injector line or fuel injector fitting will cause a fuel leak.
  8. Install the left fuel injector pipes and tighten to 41 N.m (30 lb ft).
  9. After installing the fuel injector pipes, clean the injector pipes and apply sealant GM P/N 97720043, at the fittings to prevent moisture and debris from collecting between the line and fitting.
    10. Fig 6: Identifying Engine Wiring Harness Bracket Bolts
    GM1732378Courtesy of GENERAL MOTORS CORP.
  10. Position the engine wiring harness bracket (1), install the engine wiring harness to bracket bolt and the 2 engine wiring harness bracket to upper valve cover bolts and tighten to 21 N.m (15 lb ft).
  11. Connect the left engine wiring main harness connector.
  12. Install the injector/glow plug wire harness retaining bolt at the lower part of the upper valve cover.
  13. Install the glow plug module and bracket. Refer to Glow Plug Control Module Replacement .
  14. If equipped, install the auxiliary generator. Refer to Auxiliary Generator Replacement .
  15. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement (6.6L) .
  16. If the fuel injectors were replaced, refer to Fuel Injector Flow Rate Programming .
  17. Prime the fuel system. Refer to Fuel System Priming .
  18. Start the engine. If the engine stalls, repeat the above step.
  19. Once the engine starts, inspect for fuel leaks.
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