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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 138 (ENGINE CONTROLS REMOVAL & INSTALLATION)FUEL SYSTEMS (CNG ENGINE)CNG FUEL MODULE ASSEMBLYDISASSEMBLY & REASSEMBLY
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Disassembly & Reassembly

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Disassembly & Reassembly
WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove fuel line between LPL solenoid and Low Pressure Regulator (LPR). Loosen hose clamps on vapor hose between LPR and GMS/MCV). Remove GMS/MCV and bracket from CNG fuel module assembly bracket as an assembly. Remove LPR from CNG fuel module assembly plate. Remove LPL and bracket from CNG fuel module assembly bracket as an assembly.
  2. To install, reverse removal procedure. Tighten all fasteners to specification. See TORQUE SPECIFICATIONS . Start the engine. Using Ultrasonic Leak Detector (J 41416), check for CNG fuel leaks at each serviced fitting.
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.