Creedence

Anybody got any ideas about what would cause a fuel gauge to go all the way up then slowly go back down and then settle all the way at the top and generally act bat **** crazy? Personally I would have to assume wiring, but since that is not my forte, I was hoping there might be other things I can check before doing that. The car is an 87 5.0.

mattdel

wiring.

72MACH1_92LX50

Could be a bad Fuel Level Sending Unit (mounted in the tank). I changed mine a few months ago (it would never read full).I had it tested and it did not meet specs. Now it reads just fine. See link below.

http://www.latemodelrestoration.com/...1&comp=LRS

1990fox5.0

i bought the sending unit because my meter was just seating at the bottom of the gauge,and it do anything and i put some of that feul cleaner, and now it moves but it just reads diff levals everytime i start the car. any answers. i drive a 1990 lx 5.0

mjr46

I doubt it's wiring................most likely a bad sending unit that is picking up a ground intermitently...using a decade box or gauge tester will verify this.... that's what I use and never fails to diagnosis the prob