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 973 (ENGINE CONTROLS - 6.6L (LB7) (INTRODUCTION))REPAIR INSTRUCTIONSFUEL SYSTEM CLEANINGCLEANING GASOLINE FROM THE FUEL SYSTEM
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Cleaning Gasoline from the Fuel System
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Cleaning Gasoline from the Fuel System
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Drain the fuel tank.
- Fill the fuel tank to 1/4 full.
- Remove the ignition 1 relay from the underhood relay center.
- Loosen the fuel filter drain and connect the filter to a hose that flows into a metal container.
- Operate the fuel system hand primer at the fuel filter until clean fuel flows from the fuel filter drain into the metal container.
- Hand tighten the fuel filter drain and disconnect the hose.
- Install a hose on the fuel return line near the glow plug relay, and insert other end into a 7.6 liters (2 gallon) metal container.
- Crank the engine for 30 second time intervals, with 1 minute cool down periods. Continue until 3.8 liters (1 gallon) of fuel has passed into the container.
- Reconnect the fuel return line.
- Install the ignition 1 relay into the underhood relay center.
- Attempt to start and run the engine for 15 minutes (If engine does not start, operate the hand primer for 30 strokes, or until firm).
- Stop the engine.
- Clean any fuel spillage from the engine.
- Clear the engine of any diagnostic trouble codes (DTCs).
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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.