fuel gauge not working

[06strokerIsh]

I'm thinking I need a new sending unit, but I figure I'll see what you guys think. Anyhow, It takes about 3 week for the gauge to show half tank after I fill up but, every time I fill up it takes like 23 gallons I know my tank is bigger than that but it's definetly not a 46 gallon tank. Anyhow I did that a few times, but now I just fill it up every 200 miles. Plus where I bought the truck won't replace it because they said it may have been the mods that made the gauge stop. I started using standyne fuel treatment, because a few guys said I might have sulphur deposits, but I just want to change the whole fuel system, so I don't have to play guessing games anymore, any ideas fellas?

[03-blue-Powerstroke]

I was having the same problem with my truck for a couple of months. It would take a couple of days to go to full. I used some fuel treatment and luckily it fixed it. I think my sending unit is starting to die. Thats probably what is happening to yours too.

[Farmertom390]

Mine is being very weird too, it goes to full but then when it gets to a quarter tank it starts heading back to full instead of E... when it hits the full mark its EMPTY

[tneibling]

i'm having a similar problem with my 97 OBS on the front tank only (it has 2). it shows WAY ABOVE full all the time and will not move until i switch to the rear tank.
How hard is it to replace the sending unit? do you have drop the tank?

[zippy557]

i had a problem with mine about 3 months after i bought it ... brand new ...and they replaced the sending unit and has been fine since then ... he told me not to fuel up with the truck running or the key on or it may mess it up again

[06strokerIsh]

yea my 2001 ranger gauge never worked cuz i filled it up while the truck was running, messed up fuel gauges must be a ford trait i guess?

[diesel01]

That bites I just filled my truck yesterday while the truck was running because it was cold and my truck wasn't warm yet and as I pulled away I noticed the gauge was only on 1/2. Does this mean I fried my sending unit. I wish I would have read something that warned me sooner. Good thread now though.

[zippy557]

i dont know if it will ruin it if you do it once but i try to not do it at all and take the key completely out when i fuel up ... i have heard it is a ford trait to have crappy sending units.

[Farmertom390]

Well its a chevy trait to have ones that are even worse. Every chevy that I've ever owned (ack 2) and everyone that I've ever driven had a broken fuel gauge.

[SMKSTAX]

Ian did you ever figure out what the problem was?