SOURCE: Fuel Gauge not working
The switch that you use to change tanks is probably faulty - the switch supplies power for the sending unit in the tank, and to the transfer switch for the gas lines - use a meter to check it
SOURCE: fuel tanks not switching
It likely has a bad lift pump in the front tank. If this is a gas truck it has 3 fuel pumps, one in each tank (Low pressure, lift pumps) and one on the frame rail. Check for power and ground at the front tank for the lift pump.
SOURCE: fuel tank selector valve
Black plastic with round screw off bottom with lots of line's coming in and going out, it is on the inside frame rail just behind driver.
SOURCE: where is the fuel tank selector valve exactly located
Just in front of the side tank is the selector.Very common problem.The rear fuel tanks pump quits.
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589
SOURCE: I have a 1988 Ford F250 with the 460 engine and
The fuel pump relay and the oil pressure switch as well. The oil pressure switch runs power to the fuel pump when you first start it
When the oil pressure reaches operating range the relay takes over
They are both inexpensive so replace both of these parts to be safe and kill two birds with one stone. If one goes out the other will soon enough
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