[VWNate1]

First things first as the sender rarely poops out and God knows , the new Chinese ones aren't worth spit .

Get some 6' lengths of wire , like old power cords from those junked TV sets on your curb , strip off 3" of bare wire on each end .

Jamb one end of this wire in the slider of the ash tray then touch the other end to the fuel sender's connection and turn on the key ~ this should drive the gauge to one extreme ~ if it does , disconnect both the jumper wire and the sender wire and the gauge should drive to it's other extreme .

*if* the gauge can be driven to it's extremes this way , then the sender is bad .

90 % of the time there's a bad ground between the tank and the cab / frame .