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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 136 (ENGINE CONTROLS - REMOVAL, OVERHAUL & INSTALLATION - EXCEPT DIESEL)FUEL SYSTEMSFUEL METER BODY ASSEMBLYINSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Fuel Meter Body Assembly: Installation

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Verify injectors are firmly seated and locked in their casting sockets, in order to reduce the risk of fire and personal injury. An unlocked or loose injector could work loose from it's casting socket and produce a fuel leak.
  1. Install fuel meter body into bracket on lower intake manifold. Ensure fuel meter body is locked into place. Install injectors into proper lower intake manifold casting sockets. Verify injectors are firmly seated and locked into the correct casting sockets.
  2. Install a NEW fuel meter body seal. Install upper intake manifold. See INTAKE MANIFOLD . Tighten all nuts and bolts to specification. See TORQUE SPECIFICATIONS . Connect negative battery cable.
  3. Turn ignition switch to ON position for 2 seconds. Turn ignition switch to OFF position for 10 seconds. Turn ignition switch to ON position. Check for fuel leaks. Repair as necessary.


  1. Install fuel meter body into bracket on lower intake manifold. Place all fuel tubes in a forward position. See Fig 1. Route the No. 3 fuel tube behind No. 1 and 5 fuel tubes and insert No. 3 fuel tube into No. 3 casting socket. Verify No. 3 injector is firmly seated and locked into the correct casting socket.
    2. WARNING: Verify injectors are firmly seated and locked in their casting sockets, in order to reduce the risk of fire and personal injury. An unlocked or loose injector could work loose from it's casting socket and produce a fuel leak. If an injector is loose, replace the retainer.
  2. Insert No. 5 fuel tube into correct casting socket, followed by No. 1, 2, 4, and No. 6 last. Ensure electrical connectors on the injectors do not interfere with each other and point towards the center of the intake manifold. Rotate the electrical connectors inboard, if necessary.
  3. Install upper intake manifold. See INTAKE MANIFOLD . Tighten all nuts and bolts to specification. See TORQUE SPECIFICATIONS . Connect negative battery cable.
  4. Turn ignition switch to ON position for 2 seconds. Turn ignition switch to OFF position for 10 seconds. Turn ignition switch to ON position. Check for fuel leaks. Repair as necessary.
Fig 1: Installing Fuel Meter Body (4.3L)
G00143832Courtesy 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.