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 MANUALSCHEVROLET1981PICKUP C10, 4.1L ENG VIN D, AUTOMATIC TRANSREPAIR AND DIAGNOSISELECTRICALBODY ELECTRICALFUEL SELECTOR VALVES - ELECTRICTESTINGFORD
1981 Chevrolet Pickup C10, 4.1L Eng VIN D, Automatic Trans
Fuel Selector Valves - Electric: Testing: Ford
1981 Chevrolet Pickup C10, 4.1L Eng VIN D, Automatic TransSECTION Ford
- Turn ignition switch "ON" and place fuel selector switch on rear for "F" models, or front for "E" models. Disconnect selector valve feed wire and connect a 12 volt test light between wire harness terminal and ground.
- If light does not come on, check fuse at fuse block. If fuse is blown, check fuel valve circuit and valve for short. If fuse is okay, check switch for continuity. If no continuity, replace switch. If switch is okay, check wiring and valve for open circuit and repair as necessary.
- If test light comes on, reconnect feed wire and place a paper clip on end of valve opposite port end. Paper clip should adhere to valve. If not, ground valve case to frame rail with short piece of wire and repeat paper clip test.
- If paper clip does not adhere, replace valve and solenoid assembly. If paper clip adheres, remove valve mounting bolts and clean mounting surface. Install new mounting bolts that are zinc or cadmium plated.
- If the paper clip adhered in step 3) position selector switch on front for "F" models, or rear for "E" models. Pinch off fuel hose from valve to main tank and remove fuel line from carburetor and place end in a container. Remove battery feed from coil and crank engine.
- If fuel flows continuously, remove and replace valve solenoid assembly. If no fuel flows into container, unpinch fuel hose and crank engine to reestablish fuel flow.
- Place selector switch on rear for "F" models, or front for "E" models. Pinch off hose from valve to rear tank on "F" models, or front tank on "E" models. Crank engine and observe fuel flow.
- If fuel flows continuously, replace solenoid and valve assembly. If no fuel flows, system is operating correctly and problem has been misdiagnosed.NOTE: Testing procedures for General Motors vehicles were not available from manufacturer.
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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.