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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 134 (ENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURES)BASIC FUEL SYSTEM CHECKS (GASOLINE)FUEL SYSTEM PRESSURE TEST (2.2L & 3.0L VUE)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Fuel System Pressure Test (2.2L & 3.0L VUE)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fuel System Pressure Test (2.2L & 3.0L VUE)
WARNING: This page does not describe the selected car, but rather 33 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.

Install a Fuel Pressure Gauge (SA9127E) to fuel service test port. Turn ignition on, with engine off. Using a scan tool, command fuel pump on. Fuel pressure should be 50-60 psi (3.5-4.2 kg/cm2 ). If fuel pressure is not as specified, diagnose fuel system.

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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.