That is a Fuel Tank Selector Switch.
What's the use of an extra fuel tank filled with fuel if you can't gain access to it because of a damaged fuel tank selector switch? A dual fuel tank can be a great benefit to your vehicle. It reduces the chance of getting stranded at the side of the road because of loss of fuel. It also lessens the interval by which you visit the gas station for a fuel refill. For you to enjoy all these benefits, however, you need to keep the switch operating in top condition. This switch is your access to the two fuel tanks in your vehicle, opening and closing the door of the tanks to control which tank will be used. However, there are instances when the fuel tank selector switch becomes damaged. Exposure to harsh elements can cause the switch to break over time. And when this happens, you have no way of gaining access to one of the tanks in your vehicle. This may not seem like a problem at first, until your vehicle dies on you because of fuel starvation.
Sends power to the selector causing the door inside the unit to open and close swapping tanks. On a 92-96 Ford F series it is located to the right of the headlight switch, too the left of the instrument cluster. The tanks are supposed to run independent of the other tank and only the tank you chose should be supplying fuel. With age I find these tanks mess up in all sorts of ways. It is possible that the switch is malfunctioning and pumping from both tanks but as far as the front tank going from 3/8 to 5/8 when you filled up, by design that can't happen. What probably happened was the gauge settled down enough to read the actual fuel amount. I suspect a problem with the front tank since you can not run the gauge down to E whether because the gauge is reading wrong or the tank won't suck up gas that low in the tank.
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