Another Fuel Gauge Question

A couple of years ago I replaced the Speedo cluster. The Temp and Fuel gauges worked - for awhile. I did some checking and found the tank sending unit was not working .

So a couple of months ago, I pulled the tank (it was leaking from the sending unit anyway) and replaced the sending unit (10 to 73 ohms), but the fuel gauge still did not work. Last month I put in a separate 2" fuel gauge and I was in heaven - I knew how much fuel was in the tank when we went for "a ride".

OK, so here's the question - this past Saturday, we were out riding and the fuel gauge went from 3/4 to pegged full! I have not started trouble shooting this yet other than to disconnect the sender wire (goes back to E) and disconnecting the Hot wire (goes to E) until I put the hot wire back and turn on the key - then pegs at Full.

I have read the link from the other fuel gauge thread and have that for reference now, but do you guys thingk that a 2 month sending unit would just go bad or should I think - Ground - SHORT?

This is on a 1975 CJ5 with a 2 year old Painless Wiring harness and no mods since putting it in. I'm getting the Hot lead from the cluster. Maybe I should try running a hot lead from the fuse block after testing the ohms at the sender??

It worked and then just BROKE :evil: and the road was not that bad at all!

Thank you,

Bill W
'75 CJ5, '45 MB, '41 "Slat Grill" MB

 

I've had sending unit modules break off the assembly within hours of installation.
Next time will be an Accel Universal kit.

Look at the bright side - at $2.18/gal, I'd love to have my fuel self propagate.


gj