fuel sending unit not working right

[booger1949]

my gas tank was leaking in my 49 so i changed it now it shows full all the time, an i installed a ground to my cab just to make sure that it wasnt that, ive tried two sending units an both do the same, any help

[JumboAMONGus]

my 56 says 3/4 and when you sit on the seat it bounces to empty then full then sometimes it works ,, hahha and nothing is grounding out..maybe check the make sure the power wire is going to the + side wish i could out on that

[D-man313]

Is the float stuck? My internal float on my sending unit wasnt working, read the same thing all the time. Took it all apart and the little half round plastic float that moves up and down and sends signals to the gauge, was a little tight(wouldnt move up or down). So took the float out and sanded in down and now it works great.

[booger1949]

i unhooked the wires off the tank an it still said full, so i went to the gauge an lo an behold the voltage reducer is shot, showin 12 volts on each side, dont that just suck, so ordered another one, i pray to god i dont have to take the cluster out an replace the gauge now, thanks for yaws advice