How do i fix the meter on the gas? i can fill my tank up and it still sits on a quarter full

fuel pump

run the fault codes as the problem is normally about venting and this is a purge valve for the canister problem. having said that there are lot of poorly designed fillers on the market that will not allow quick fills as the pump hose trigger keeps cutting of no no reason. You may have to just take your time when filling like most people do.
In this country lock fillers have been banned and you have to hold the trigger until the tank is full. Stops idiots from putting the nozzle in the tank and then wandering off and allowing the tank to over fill and create a dangerous situation..

I would guess you will have to replace the sending unit in the tank. A mechanic can check the sending unit with a meter and find out if the sending unit is faulty or the gauge on the dash.

put a test light on the wire from the tank if the gauge goes to full its a bad sending unit in the tank

your fuel sending sensor is bad ..and is inside the gas tank

It depends on the quality of the parts, but it should be fine after you have it fixed. The fuel level sending unit is in the gas tank, so there is not a whole lot of wear and tear on it. Just make sure that you have a good gas cap, and try to keep it as full as you can to avoid excessive moisture in the tank.

Sending unit in gas tank or bad ground

This isn't a definite fix, but it may be that the gasoline in your tank is 'sloshing' forwards and backwards and your sensour is getting readings when the gasoline is in different positions in your tank. The connection is actually above your gasoline tank and you'll have to take off the tank harnesses and drop the tank if you want to check to see if the connection became slightly loose, otherwise you can just fill your gas tank and reset your temporary milage gage (that's the little black button near your RPM meter) and remember how many miles you get per tank.

there is little else that causes this except the fuel guage sending unit in the gas tank.