1991 Ford Explorer

fuel gauge will not work, all other gauges operate properly

did you check your fuses, some under the hood and some under the dash. look at your manual.

m f

Does the gauge move closer to empty when the key is turned on? If so, it's more than likely youre sending unit. If your lucky it's a $6 brass float. If not, you will have to replace the whole thing for MUCH more.