Gas gauge works and then doesn't.Any ideas?

 

your sending unit maybe going bad it happened to my buddie in his ford

 

And it could be something as simple as a bad or loose connection somewhere. What year is the truck? Ive got a good and complete fuel pump out in the shop.

 

2005 2500 it screwed up one day a few times and has not done it since. I'm sure it will again but should wait til fuel pump goes totally at the cost to replace. It's all one unit i think. Drop tank ect. to get at it right?

 

Yeah, drop the tank, disconnect the fuel lines, disconnect the 4 pin electrical harness, pop off the locking ring on top and lift the pump straight up and out. Not hard at all. Again, Ive got a spare pump if you ever device you need one.

I would let it go for $75 shipped. Ive priced them new at $225

 

mine does the same thing i can turn on the truck and it will read E then if i turn it off then back on it works fine only happens every now and then

 

My 02 does this as well, usually when I'm around half a tank. My mechanic friend says sending unit, but I consider it kind-of harmless, haven't bothered with trying to fix as yet.