JoeyStangz00

Okay so I have a 2000 Mustang Gt 5 speed, the issue i'm having is that the fuel gauge doesn't accurately tell the amount of fuel over 1/4 a tank. If i fill it up, brings it to 3/4 and gradually goes up and then goes back down in a short amount of time. Anyone know where i can start with diagnosing this issue?

thanks