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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 462 (ENGINE CONTROLS - REMOVAL & INSTALLATION)FUEL SYSTEMSFUEL RAIL ASSEMBLYINSTALLATION
2004 Oldsmobile Bravada AWD

Fuel Rail Assembly: Installation

2004 Oldsmobile Bravada AWDSECTION Installation
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Lubricate the new lower injector "O" ring seals (4) with clean engine oil. See Figure.
  2. Install the new "O" ring seals (4) on the spray tip end of each injector (3).
  3. Install the fuel rail assembly.
    NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the fuel rail attaching bolts. See Fig 3. Tighten the bolts to specification. See TORQUE SPECIFICATIONS .
  5. Connect the fuel feed and return pipes (1, 2) to the fuel rail. See Fig 2. See FUEL LINE DISCONNECT FITTINGS (4.2L) .
  6. Connect the fuel injector electrical connectors.
  7. Connect the fuel pressure regulator vacuum line. See Fig 1.
  8. Install the intake manifold. See INTAKE MANIFOLD .
  9. Connect the negative battery cable.
  10. Inspect for leaks.
    • Turn ON the ignition, with the engine OFF for 2 seconds.
    • Turn OFF the ignition for 10 seconds.
    • Turn ON the ignition, with the engine OFF.
    • Inspect for fuel leaks.
Fig 1: Removing & Installing Fuel Rail Assembly (1 Of 3)
G00256509Courtesy of GENERAL MOTORS CORP.
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.