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 760 (FUEL SYSTEM)FUEL PUMP UNIT REMOVAL/INSTALLATIONFUEL LEAKAGE INSPECTION AFTER PUMP UNIT INSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Fuel Leakage Inspection After Pump Unit Installation
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fuel Leakage Inspection After Pump Unit Installation
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
- Before installing the fuel tank, verify that there is no leakage when a pressure of 5.9 kPa {44 mmHg, 1.7 inHg} is applied to the fuel tank.
- Install the fuel tank. (See FUEL TANK REMOVAL/INSTALLATION .)
- Drive the vehicle starting from a standstill and brake suddenly five to six times at a low speed.
- Stop the vehicle and verify from outside the vehicle that there is no fuel leakage around the fuel pump unit.
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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.