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OT F250 fuel gauge quit

T

TWheat

Member
(Diesel) I put a few $ of fuel in the front tank and while driving down the road looked to see how much it had registered on the guage. Showed empty. Switched to the rear tank which I usualy leave low and it showed less than a quarter tank so I didn't put it in the rear tank and the gauge works on the rear tank. When I got home I crawled under the truck to check for loose wires,every thing I could see looked OK. What happened ? Any way to check without removing tank?
 
The older Fords used a printed circuit board as the sending unit for the gauge. There is a metal contact attached to the float arm that moves across the circuit board as the float moves up and down. Eventually the moving contact wears the solder tracks off of the board.
 
They had a bad habit of fuel returning to the wrong tank in those trucks. Whichevere tank is filling up on its own has a bad check valve in the pump assy. The way the senders work, if the sender goes bad or wiring has an open, the guage reads past full. If it says empty, it is, or guage has a short to ground.
 
The diesels didn't have as much trouble with
cross flow between tanks as the gas engines.
My guess is like others you need a Very Pricey
fuel gauge sending unit. I remember I usta
sell gauge unit's for 27.95, those days are
long gone....
 
That only holds true for old GM. The selector valve on a diesel is a motor driven type. The gas Fords that transferred fuel tank to tank had a pump in the tank. Fuel flow is what caused the selector valve on them to change position.
 
Old ones had basically a hot wire(from ignition)going to gauge and other side of gauge to tank unit which is resistor slide with float. All I know. Sometimes ground wire from tank to frame will fix some of them. Dave
 
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