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 140 (ENGINE CONTROLS - REMOVAL, OVERHAUL & INSTALLATION - GASOLINE)FUEL SYSTEMSFUEL SYSTEM CLEANING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Fuel System Cleaning
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fuel System Cleaning
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
When flushing the fuel tank, handle the fuel and water mixture as a hazardous material. Handle the fuel and water mixture in accordance with all applicable local, state and federal laws and regulations.
- Disconnect the negative battery cable. Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE . Drain fuel tank. Remove the fuel tank. See FUEL TANK . Remove fuel pump module. See FUEL TANK PUMP MODULE . Inspect the fuel strainer. Replace a contaminated strainer and inspect the fuel pump. Inspect the fuel pump inlet for dirt and debris. Replace the fuel pump if you find dirt or debris in the fuel pump inlet.
- Flush the fuel tank with hot water. Pour the water out of the fuel sender assembly opening. Rock the tank to ensure that removal of the water from the tank is complete. Inspect the fuel filter for contamination. Replace the fuel filter if the filter is plugged. See FUEL FILTER .
- Clean the fuel lines by applying air pressure in the opposite direction of the fuel flow. Install the fuel pump module with NEW seal into the fuel tank. Install the fuel tank. Turn ON the ignition for 2 seconds. Turn OFF the ignition for 10 seconds. Turn ON the ignition. Inspect for fuel leaks.
NOTE:
Only use oil-free compressed air to blow out the fuel pipes.
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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.