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 245 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 4.3L)FUEL SYSTEMSFUEL SYSTEM CLEANINGCLEANING PROCEDURES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Cleaning Procedures
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Cleaning Procedures
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Safari, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect negative battery cable.
- Relieve fuel system pressure. Refer to FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP article.
- Drain fuel tank.
- Remove fuel tank.
- Remove fuel sender assembly.
- Inspect fuel strainer. Replace a contaminated strainer and inspect fuel pump.
- Inspect fuel pump inlet for dirt and debris. Replace fuel pump if you find dirt or debris in fuel pump inlet.
- Flush fuel tank with hot water.
- Pour water out of fuel sender assembly opening.
- Rock the tank to be sure that removal of the water from tank is complete.
- Inspect the in-line fuel filter for contamination.
- Replace fuel filter, if plugged.
NOTE:
When flushing fuel tank, handle fuel and water mixture as a hazardous material. Handle fuel and water mixture in accordance with all applicable local, state and federal laws and regulations.
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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.