fuel gauge question
 

My '95 F150 has a long bed with dual gas tanks. I filled up the truck the other day and the front tank read 1/4; switching to the rear, it had 1/2. So I filled the front up and when I switched the tank selector back to front it read "Full". I didn't fill the rear tank since it still had a half tank. Long story short, when I used up the fuel in the rear tank, I switched back to the front, but this time the fuel gauge read "E". I filled the rear and topped off the front but switching to the front tank, the fuel gauge drops to "E". My guess is that I have a bad sending unit in the front tank. Do you guys concur??

I'm thinking that I have a grounding problem. When I first bought the truck, the previous owner, a close friend and co-worker said that the fuel gauge for the front tank(when switched), power windows and power locks quit working over a year ago; since I work at a dealership, I have co-workers who are repair techs and one of them diagnosed the problem as a "bad" ground. Well he "fixed" the problem by cutting the ground wire for the windows and wiring a direct ground to the chassis. Now the problem is every once in a while, my "CHECK ENGINE" light comes on and the fuel gauge will work and then quit. Any of you guys have this same problem??

find the ground and shine it up and re tighten the bolt. you could even throw some dielectric grease on it i suppose.