Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 138 (ENGINE CONTROLS REMOVAL & INSTALLATION)FUEL SYSTEMS (CNG ENGINE)FUEL PRESSURE SENSORREMOVAL & INSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Removal & Installation
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal & Installation
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.
- Fuel Pressure Sensor (FPS) is located in High Pressure Lock-Off (HPL). See Figure. Release CNG fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE (CNG) . Turn ignition off. Disconnect negative battery cable.
- Remove spare tire cover. Remove jack and tool kit. Remove spare tire. Remove 4 tank cover bolts. Remove tank cover.
- Remove the fuel line vent boot cover nuts. Remove electrical connectors as necessary to remove fuel line vent boot cover. Remove fuel line vent boot cover. Disconnect FPS electrical connector. Remove FPS from HPL.
- Install FPS using a new "O" ring. Lubricate "O" ring with petroleum jelly. Tighten FPS to specification. See TORQUE SPECIFICATIONS . Connect electrical connectors. Connect negative battery cable.
- To complete installation, reverse removal procedure. Tighten components to specification. See TORQUE SPECIFICATIONS . Start the engine. Using Ultrasonic Leak Detector (J 41416), check for CNG fuel leaks at each serviced fitting.
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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.