fuel guage stuckon full

83f350 · Mar 27, 2013

Im having a problem with my fuel gauge, I was driving a couple days ago and all of a sudden my fuel gauge jumped up to full. What could cause this?

lincolnlocker · Mar 27, 2013

how full was it when it just jumped to full?

live life full throttle

Arisley · Mar 27, 2013

The float could be stuck. Beat on the tank with a baseball bat or a hunk of 2X4. That might free it up. If that don't work, pull out the multimeter.

PA Stroker · Mar 27, 2013

Happened to mine the float actually fell off the sending unit.

lincolnlocker · Mar 27, 2013

what andy said too... my rclb truck was stuck like that for two years before i bought it... everyone said odds are float is stuck.. sure as **** the float was stuck up in next to tge very top of the tank... when i dropped the tank and popped tge ring off tge float popped out the top.

live life full throttle

Charles · Mar 27, 2013

PA Stroker said:
Happened to mine the float actually fell off the sending unit.

That wouldn't make it read empty?

83f350 · Mar 27, 2013

It was a little under 1/2 tank when it happened

lincolnlocker · Mar 27, 2013

bet its stuck up in the top.

live life full throttle

CSIPSD · Mar 27, 2013

Pull the plug and clean it, then dieelectric grease.

If that doesnt help, drop the tank and check the sending unit. Most times its the float stuck to the top of the tank, but in your case I suspect a bad unit.

83f350 · Mar 28, 2013

Alright, ill do that. What should I see when I hook the multimeter up?

Charles · Mar 28, 2013

It's been so long since I've dropped my tank, and the 550 is totally different, I have forgotten how the float and arm are oriented.

Does anyone have a picture of the bulkhead removed so a person would know where to rap on the tank to attempt and dislodge a stuck float? Mine's read full for over a year.

CSIPSD · Mar 29, 2013

Charles said:
It's been so long since I've dropped my tank, and the 550 is totally different, I have forgotten how the float and arm are oriented.

Does anyone have a picture of the bulkhead removed so a person would know where to rap on the tank to attempt and dislodge a stuck float? Mine's read full for over a year.

No picure but the only place they get stuck is inside the access to the tank. they just jump up there where the collar is.

FILDO · May 2, 2013

That happens to my truck also. I just run some Diesel Kleen fuel additive and it has always gone away. To be honest with you, I'm
not positive if the additive is helping or not. I guess it could be an intermittent problem that just goes away after time.