2009 Hummer H3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Installation Procedure

    Fig 1: View Of Fuel Injector, Clip & O-Rings
    GM351185Courtesy of GENERAL MOTORS CORP.
  1. Lightly lubricate the new lower fuel injector O-ring seals (4) with mineral oil GM P/N 9981704.
  2. Install the NEW O-ring seals (4) on the spray tip end of each fuel injector (3).
    3. Fig 2: Identifying Fuel Rail Assembly
    GM1565309Courtesy of GENERAL MOTORS CORP.
  3. Position the fuel rail to the cylinder head, inserting the spray tip ends of the fuel injectors.
    4. CAUTION: Refer to Fastener Caution .
  4. Install the fuel rail bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    5. Fig 3: View Of ECT Sensor, Fuel Injector, Ignition Coil & HO2S Engine Wiring Harness Electrical Connectors
    GM1350694Courtesy of GENERAL MOTORS CORP.
  5. Connect the fuel injector harness connector (2) to the engine wiring harness electrical connector.
  6. Install the intake manifold. Refer to Intake Manifold Replacement .
    7. Fig 4: View Of EVAP Canister Purge Pipe, Throttle Body Module & EVAP Canister Purge Solenoid Valve
    GM1352026Courtesy of GENERAL MOTORS CORP.
  7. Refer to Plastic Collar Quick Connect Fitting Service  in order to connect the EVAP purge hose (1) to the following:
    • The throttle control module (2)
    • The EVAP canister purge solenoid valve (3)
    8. Fig 5: Identifying Fuel Feed Lines, Connections & Clips
    GM1560094Courtesy of GENERAL MOTORS CORP.
  8. Connect the fuel feed line to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  9. Engage the fuel feed quick connect locking clip (1).
  10. Inspect for leaks.
    1. Turn ON the ignition, with the engine OFF for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition, with the engine OFF.
    4. Inspect for fuel leaks.
Chapter Navigation
Return to Chapter: Fuel Injection Fuel Rail Assembly Replacement
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.