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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 69 (ENGINE PERFORMANCE SYSTEM REMOVAL, OVERHAUL & INSTALLATION - BI-FUEL)FUEL SYSTEMSFILL LINEREMOVAL & INSTALLATION
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Removal & Installation
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Removal & Installation
WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Disconnect the negative battery cable. Remove the fuel tank shield. See FUEL TANK SHIELD . Remove the check valve clamp bolt. Remove the fill line at the high pressure lock-off fitting. Disconnect the fill line at the fill valve fitting. Remove the fill line assembly from the vehicle.
- To install, place the fill line assembly between the rear tank high pressure lock-off and the fill valve. Install the fill line fitting to the fill valve using a NEW "O" ring. Lubricate "O" ring with petroleum jelly or equivalent before installation. Tighten the fill line fitting. See TORQUE SPECIFICATIONS . Install the fill line at rear tank high pressure lock-off fitting using a new "O" ring. Install the check valve clamp bolt. Tighten the bolt. Tighten the fill line fitting. Connect the negative battery cable. Prime the CNG fuel system by cycling the ignition ON and OFF several times. Start the engine and use Ultrasonic Leak Detector (J 41416) in order to inspect for CNG fuel system leaks at each serviced fitting. Install the fuel tank shield. See FUEL TANK SHIELD .
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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.