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Home >> Hummer >> 2006 >> H3 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.5L - Introduction (2 Of 2) >> Repair Instructions >> Fuel Rail Assembly Replacement >> Removal Procedure
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Removal Procedure

  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
    2. Fig 1: Fuel Feed Lines
    GM1560094Courtesy of GENERAL MOTORS CORP.
  2. Disengage the fuel feed quick connect locking clip (1).
  3. Disconnect the fuel feed line from the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
    4. Fig 2: View Of EVAP Canister Purge Pipe, Throttle Body Module & EVAP Canister Purge Solenoid Valve
    GM1352026Courtesy of GENERAL MOTORS CORP.
  4. Refer to Quick Connect Fitting(s) Service (Plastic Collar)  in order to disconnect the evaporative emission (EVAP) purge hose (1) from the following:
    • The throttle control module (2)
    • The EVAP canister purge solenoid valve (3)
  5. Remove the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical - 3.5L (L52).
    6. Fig 3: View Of ECT Sensor, Fuel Injector, Ignition Coil & HO2S Engine Wiring Harness Electrical Connectors
    GM1350694Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the fuel injector harness connector (2) from the engine wiring harness electrical connector.
  7. Before removal, clean the fuel rail assembly and the cylinder head with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
    8. Fig 4: Fuel Rail Assembly
    GM1565309Courtesy of GENERAL MOTORS CORP.
  8. Remove the fuel rail bolts.
    9. NOTE:
    • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
    • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
  9. Remove the fuel rail from the cylinder head.
    10. Fig 5: View Of Fuel Injector, Clip & O-Rings
    GM351185Courtesy of GENERAL MOTORS CORP.
  10. Remove the fuel injector lower O-ring seal (4) from the spray tip end of each fuel injector (3).

    Discard the O-ring seal (4).

  11. If the fuel rail is not being replaced, proceed to the installation procedure.
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