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 MANUALSGMC1995FORWARD CONTROL 4.3 Z, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 68 (ENGINE CONTROLS - REMOVE/INSTALL/OVERHAUL - 5.2L CNG)FUEL SYSTEMFUEL FILL CHECK VALVESNOTES
1995 GMC Forward Control 4.3 Z, Standard
Fuel Fill Check Valves: Notes
1995 GMC Forward Control 4.3 Z, StandardSECTION Notes
WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
CNG vehicles use 2 fuel fill check valves. One check valve is located on frame rail near top of left rear shock absorber. Other check valve is integral to fuel fill receptacle. If this check valve is defective, fuel fill receptacle MUST be replaced. See FUEL FILL RECEPTACLE .
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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.