Posted by farmallhal on January 27, 2015 at 07:28:27 from (76.2.174.242):
In Reply to: Gas Gauge. posted by lfure on January 27, 2015 at 06:37:00:
If it is anything like the gauging system on my Farmall 240 and I believe it most likely is, it could be either. I believe you can remove the cap to the fuel tank and stick a clean stiff piece of wire into the tank and move the float up and down on the tank unit. Movement of that float should provide a change in your fuel level being displayed by the dash unit with the key switch on. That would probably confirm or eliminate the tank unit from issues. As I recall both the tank sending unit and dash gauge need a very good ground to be functional. It is possible the lack of a good ground is causing your present issue. If either or both of these components are just grounded through the sheet metal on the tractor some rust or other corrosion could likely be the culprit. A word of caution if you get into the wiring on the back of the dash gauge the wire from the tank unit and the one which provides voltage at the dash gauge must be reinstalled on the same posts from which they were removed. I would suggest you tag the two contacts on the back of the gauge as to which wire connects where. I believe even a brief misplaced accidental touch with hot voltage will render it unusable so disconnect your battery if working with the tank and gauge wiring until you are finished. Good luck with your trouble shooting, Hal.
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