My fuel gage is sometimes 1/4 tank off. It tells me there is more fuel than there really is.

Could be the sending unit in the tank, or the gauge on the dash. A mechanic would check the signal from the sending unit at the tank.

When your stopped, that is usually closed throttle. I'd want to check and clean anything that has to do with idle air system, where applicable.
Sometimes with fuel gages, I do testing by using a couple of resistors representing full and empty. If your gage reacts properly, the problem should be the sending unit in the gas tank.

Find the wires that run to your fuel gage. Hook one wire to one side of a "D" cell battery and the other wire to the other end of the battery. Your fuel gage should peg itself. If so the gage is good. That will tell you that more than likely the sending unit in the fuel tank is bad, If that is the case you will need to drop the fuel tank to remove the sending unit.

The sending unit holds the fuel gauge sending unit, and maybe should be replaced by dropping the tank.

this started happening a year or so before my fuel pump whent in my 01 blazer, the fuel pump and the sending unit for the gage are an all in one pice unit that sit's right in the tank

sounds like you need new fuel pump. fuel pump located in gas tank. before you go buy a new fuel pump first push up and down on trunk of car real hard to try to dislodge the little armature inside of tank. this little armature is what sends the signal to the gauge telling you the quantity. push up and down on truck to try to dislodge small signal armature then check your quantity. try this when you are having the problem and i am willing to bet the little armature is stuck. the only way to fix is to buy a new pump.

It sounds like the fuel level sending unit located on the fuel pump is malfunctioning. The solution for this is to have it replaced. You can do this yourself but I wouldn't recommend it as the vehicle needs to be lifted and the fuel tank needs to be dropped out. This can be preformed for about 100-150 in most shops.

Yes it is all one unit, and yes that is what the problem is. don't use aftermarket parts, use OEM, (Delco Remy) they are much better quality.

it is the pontimeter in the fuel sender you can buy it seperate from the whole assembly and they had alot of problems with them please rate -jeff

sometimes beleive it or not its the gas cap is not sealing right