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Gas gauge incorrectly reading amount of gas in tank

(1999 Ford F-250)
in Santa Rosa, CA on November 03, 2010
For the second time this year, the gas gauge in my truck has been stuck on 1/4 tank for the past three days. I drive 10-15 miles a day and it hasn't budged.

Would someone please explain how this happens? Is it the quality of diesel? Number of miles I'm driving? Or?? Also, what it is I need to tell diesel mechanic so this doesn't become a 2x or more per year fix? Could this be an easy fix I can do myself?
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Popular Answer
on November 03, 2010
Sounds like an issue with your fuel pump sending unit. But you cannot be sure until you do some testing. A proper diagnostic tool can "active command" the gauge to make sure it moves as directed by a proper working sending unit. Then, the sending unit should be checked for power and ground, and even be removed to inspect for proper function.

I would not say it is the quality of diesel fuel; however, be sure to not use any Biodiesel fuel in this truck at any more than 5% concentration, or you may experience serious issues with fuel tank delamination and debris throughout your fuel system...but that's another story.

What was the fix last time?
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on November 04, 2010
Thank you for your response, DaveJHM.
The last fix was April 2010. But, there has been a few times when I thought the problem was back but it seemed to correct itself. I've been wondering when the gas gauge was going to stick again. The only other big fix I've had was In September to fix the oil draining steadily out of my truck. The mechanic that I use has a diagnostic tool. I can ask him to test my truck. Is there anything I need to have checked regarding this gas gauge issue?
on November 04, 2010
The sender could be hanging up, physically sticking causing intermittent bad readings. Sometimes it may free up, in other words. But that is just one idea.

I do not think anything is related to your oil leak repairs.

Just have him check the parameters I mentioned - active command the gauge itself if possible, check the sending unit which I believe has a parameter as well and see if what the sending unit says on the diag tool matches what the gauge says. Other than that, you need to start manually testing wires and the physical component.

Continued good luck!
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