Fuel Gauge stuck on Full....

[Blackhawk1960]

I've looked through the fantastic info on gauges and unless I missed it, I didn't see the problem I am having. I just installed a new tank, and sending unit. I added fuel and needle moved accordingly. I went and filled it up and gauge went to the full mark. The problem is that it has stayed there. After a couple of days of driving I knew it was wrong. I filled up and it took 6 gallons. It's a 15 gallon tank. The needle is stuck on full for some reason.

 

[gert]

sounds like the sending unit is stuck, or the resistor part of the sending unit is not working anymore

 

[Torxhead]

If it is a stuck sending unit or a similiar issue, that could be detected by getting a resistance reading at the sending unit wire. The resistance numbers will be in a Jeep repair manual or John Strenks New Gauge Page on the net.

 

[thistle3585]

On one of my gauges, not sure which one, I had wired it up backwards. Flipped the two wires and were good to go.