Problem with the gas gauge reading correctly at a quarter of a tank. It travels. on 1997 Cadillac Seville SLS

When the gas gauge reaches a quarter of a tank, it travels in the opposite direction. What can the issue be?

Asked by for the 1997 Cadillac Seville SLS
Fuel pump sending assembly in tank.
Thanks for responding so quickly. Is it hard and expense to replace?
Yes it is. Part will be around $250- at least thru Autozone in my area. It's in fuel tank but check your model you may have access door under back seat or in trunk ? If not tank will have to be dropped down to fix. You may just want to deal with problem till fuel pump gives out lol
LOL!!! Thanks a lot. YOu may be right. I just need to keep it full or just top it off when it gets to half. Thanks again.
Your welcome. I'd just deal with it too- could have much bigger problem lol
Thanks! You may be right about that. But if gas get's any higher, it will sit until I really need to drive it.
Yeah no doubt- they surely got us all by the balls lol