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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)FUEL SYSTEM (DIESEL)FUEL TANK LEAK TEST (6.5L & 6.6L)DIAGNOSTIC PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Diagnostic Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Procedure
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Place a dry chemical (Class B) fire extinguisher near area before performing a Fuel Tank Leak Check. Before removing fuel tank for a suspected leak, make sure fuel pipes or tubes are not leaking onto tank. Once removed, make sure fuel is not leaking around fuel sender "O" ring. Failure to follow these precautions may result in personal injury.
  1. This check requires fuel sender and "O" ring to be installed.
    2. WARNING: Before servicing any electrical component, ignition key must be in OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to vehicle or its components.
  2. Disconnect battery cables.
  3. Drain fuel tank.
  4. Remove fuel tank.
  5. Cap fuel feed tube and fuel return tube on fuel sender.
  6. Connect a piece of hose to filler tube nipple and plug opposite end.
  7. Submerge tank in water or apply a soap solution to outside of tank.
  8. Apply 5 psi (35 kPa) of air pressure to vent hose of fuel tank. A leak will show up as bubbles.
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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.