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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1410 (ENGINE CONTROL SYSTEM - 4.2L (INTRODUCTION))REPAIR INSTRUCTIONSFUEL RAIL ASSEMBLY REPLACEMENTINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Fuel Injector, Clip & O-Rings
    GM351185Courtesy of GENERAL MOTORS CORP.
  1. Lubricate the new lower injector O-ring seals (4) with clean engine oil.
  2. Install the new O-ring seals (4) on the spray tip end of each injector (3).
    3. Fig 2: Removing/Installing Fuel Rail
    GM730890Courtesy of GENERAL MOTORS CORP.
  3. Install the fuel rail assembly.
    4. NOTE: Refer to the Fastener Notice in Cautions and Notices.
  4. Install the fuel rail attaching bolts.

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

    5. Fig 3: Fuel Feed And Fuel Return Pipes (Left Side Of Engine)
    GM730718Courtesy of GENERAL MOTORS CORP.
  5. Connect the fuel feed and return pipes (1, 2) to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  6. Connect the fuel injector electrical connectors.
    7. Fig 4: Disconnecting/Connecting Fuel Pressure Regulator Vacuum Line
    GM730808Courtesy of GENERAL MOTORS CORP.
  7. Connect the fuel pressure regulator vacuum line.
  8. Install the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
  9. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  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.
RENDER: 1.0x

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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.