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 MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 66 (ENGINE CONTROLS - REMOVAL & INSTALLATION)FUEL SYSTEMS (CNG)FILL LINE UNION (CHECK VALVE)INSTALLATION
2001 Chevrolet Cavalier LS, 2.4 T
Fill Line Union (Check Valve): Installation
2001 Chevrolet Cavalier LS, 2.4 TSECTION Installation
WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- Install the fill line union (check valve) using NEW "O" ring face seals. Lubricate the "O" rings with petroleum jelly, or equivalent. Tighten the fill line union fittings to specification. See TORQUE SPECIFICATIONS .
- Connect the negative battery cable. Tighten to specification. See TORQUE SPECIFICATIONS .
- Connect the three harness connectors and the HPL harness connector.
- Start the engine. Check for CNG fuel leaks at each serviced fitting using the Combustible Gas Detector (J 45878).
- Slip the tank vent boot over the union. Tighten the boot clamp to specification. See TORQUE SPECIFICATIONS .
- Install the tank vent boot cover. Tighten the tank vent boot cover nuts to specification. See TORQUE SPECIFICATIONS .
- Install the fuel tank cover.
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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.