Gas gauge always on full?

[headrush]

I hope I'm not the only one that has had this problem, but after filling up my '97 XLT with a full tank of gas, I've noticed that the gas gauge is staying at full or slightly below it, to the 3/4 tank mark. Now it'd be great if this were due to great mileage, but I seriously doubt its the case...I've done too much driving around town, back and forth to campus, interstate driving, for there to still be as much fuel as is indicated since my last fill-up. I will say this...about a year ago my speedometer went out so I replaced it with a new gauge cluster...could it be that now my gas gauge has crapped out on me? What makes it even worse is that since I've replaced the cluster the odometer doesn't work so I can't even tell how many miles I've gone! Haha wow I have the best luck sometimes. I'm hoping it's a blown fuse or a minor fix...not something that'll break the bank. If anyone has any ideas, please let me know, thanks in advance!

 

[BrooklynBay]

It could be an internal short in the sending unit inside of the gas tank.

 

[headrush]

So how do I fix it?

 

[BrooklynBay]

You have to test the resistance of the sending unit.

 

[skoal_mint]

I have had this problem for about a year now, mostly does is on hot days or when i have more then 3/4 of a tank, but if i restart the engine it will be normal

 

[1998 Mounty]

I hope I'm not the only one that has had this problem, but after filling up my '97 XLT with a full tank of gas, I've noticed that the gas gauge is staying at full or slightly below it, to the 3/4 tank mark. Now it'd be great if this were due to great mileage, but I seriously doubt its the case...I've done too much driving around town, back and forth to campus, interstate driving, for there to still be as much fuel as is indicated since my last fill-up. I will say this...about a year ago my speedometer went out so I replaced it with a new gauge cluster...could it be that now my gas gauge has crapped out on me? What makes it even worse is that since I've replaced the cluster the odometer doesn't work so I can't even tell how many miles I've gone! Haha wow I have the best luck sometimes. I'm hoping it's a blown fuse or a minor fix...not something that'll break the bank. If anyone has any ideas, please let me know, thanks in advance!

Wish mine was full all the time.