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Fuel than sending unit

C

cole in mo.

Well-known Member
This may be a little ot, but its a farm truck, I put an international truck 35 gallon saddle tank on a 64 ford grain truck. But with the float down the guage reads full, I switched the wires, but it makes no difference. Anybody ever have that happen?
 
There are two types of those fuel gauge systems.

One type uses ground as a "full" indicator reference; the other uses an "open circut" as a full indicator.

See that a lot when working on both Fords and Chevys. They are opposite in their operation.

Kicker is that International would more than likely have the delco style (ground empty, open full)system. Trouble is, your Ford is looking for a ground for full.

Hope that makes sense.

Allan
 
thanks for the info, this unit had a ground stud on it, along with a center plug, both had wires on them. went back out a little while ago and played with it. When touching the ground wire to the tank on either post the gauge goes to full. might hafta get an after market gage for that unit.
 
Could you bend or cut and weld the float rod so it works the little reostat the opposite direction in relation to full / empty ??

Might be worth a try IF moving the sender full range produces the correct full / empty reading on the gauge. different units have different impedence of the reostat, so check if it would work before going through the trouble of modifying the float arm.
 
With two people, take the unit out of the tank and hold it in the same position it would be in if it were in the tank. If the pump is with the sending unit, disconnect it and place it aside. Attach all the remaining wires(tape off those going to the pump), and turn the key to the on position. With the sending unit in the same position that it would be in if it were installed. it should read empty.
 
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