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A few years ago on my 1996 chevy k1500, my dad and I replaced the fuel pump in my truck. It certainly was a learning experience for both of us. we chose to just drop the tank down and do it that way. after we got it all put back together it all worked and it was good to go, however then the gas gage didnt work from half a tank up but it did work from half a tank down. So I figured hey I know when its out of gas right? and it worked that way for several years. untill recently when I put some gas in the tank and now the gas gauge is really freaking out. it bounces from straight down and fighting with the oil pressure gage which probably isnt good. to full to half. but soon as it gets below half a tank it stops freaking out but still doesnt seem accurate.
my first thought is fuel sending unit. but i have done a lot of reading about it and heard anything from the instrument cluster to a ground or a bad sending unit or loose sending unit. I do remember when we pulld the tank we didnt know about the little ground wire that went from the tank to up on top of the frame and it seemse to me like we might have stressed it pretty bad 🙁 what ground does that go to exactly?
I plan on checking the grounds, wires first and i want to have the new part on hand if i have to drop the tank again so i dont have to do it twice.
Is there anything else i should watch for or check?? thanks 🙂
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I believe there is a purple wire. ground that wire and the fuel gauge
should go to full. this will tell you if the gauge and wiring do work.
Then it would leave the sender unit at fault.I grounded the purple wire and the gauge went to E not F does that mean something different?? also now it keeps have different readings it seems to work ok from about a quarter tank down. anything over that and its all over the place. My thought is if it was a bad ground it wouldnt work all the time or wouldnt have a pattern and if it was the gauge i would think that it wouldnt work ever but im not really sure. I checked the ground too while i was under there and it seemed to be clean and tight. I loosened it and moved it around a little scraping to metal to get any gunk off or out and put it back in tight.
today I finally got the fuel sending unit replaced. It took me and my dad about 2 hours total including the time we took to go to town and get a swivel socket for 2 bolts that wanted to be difficult (we showed them). and now my gas gauge seems to work perfectly fine 🙂 thanks for the help.
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