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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 973 (ENGINE CONTROLS - 6.6L (LB7) (INTRODUCTION))REPAIR INSTRUCTIONSFUEL HOSE/PIPES REPLACEMENT - CHASSIS (CAB/CHASSIS)INSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the fuel pipe bundle using the following procedure:
    1. Install the fuel bundle to the chassis by guiding the pipes towards the rear of vehicle.
    2. Lift the fuel pipes, while guiding the forward portion of the pipes up towards the engine connections.
      NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the fuel bundle nuts to the chassis.

    Tighten:  Tighten the nuts to 16 N.m (12 lb ft).

    3. Fig 1: Fuel Bundle Nuts At Chassis (Cab/Chassis)
    GM877715Courtesy of GENERAL MOTORS CORP.
  3. Connect the chassis fuel pipes to the fuel tank pipes. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    4. Fig 2: Fuel Feed And Return Pipes
    GM877717Courtesy of GENERAL MOTORS CORP.
  4. Install the fuel system cooler, if necessary. Refer to Fuel System Cooler Replacement (Pickup)  or Fuel System Cooler Replacement (Cab/Chassis) .
  5. Connect the fuel bundle clips (2) to the transmission brackets (1).
    6. Fig 3: Fuel Bundle Clips & Transmission Brackets
    GM737687Courtesy of GENERAL MOTORS CORP.
  6. Tighten the EBCM bracket bolts (4).

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

    7. Fig 4: View Of EBCM/EHCU Assembly
    GM379478Courtesy of GENERAL MOTORS CORP.
  7. Lower the vehicle.
  8. Install the fuel bundle bracket.
  9. Install the fuel bundle bracket nut.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

    10. Fig 5: View Of Fuel Hose Bracket & Nut
    GM674616Courtesy of GENERAL MOTORS CORP.
  10. Connect the fuel feed and return pipes to the chassis pipes. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  11. Purge the air from the fuel system.
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.