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.
Fuel Selector Valve: Operation
The tank selector valve allows fuel to flow from one tank in a certain position. Movement of the fuel selector switch energizes the tank selector valve and fuel pump (some models). This allows fuel to flow from a certain tank.
On the Ford Motor Co. dual function reservoir, pressure supplied by the selected electric fuel pump supplies fuel to the internal diaphragm. Diaphragm is connected to a valve shaft. Movement of the diaphragm operates the valve shaft, opening supply and return ports. When alternate fuel tank is chosen, fuel pressure is supplied to opposite side of diaphragm. This closes the supply and return ports on one side and opens the remaining ports. This allows fuel delivery from the remaining fuel tank.
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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.