2009 C70. When I fill my tank up with fuel the gas gauge does not go all the way to the "F" mark. The most it goes is 3/4 full. The tank IS full of gas. Some spilled out. What could be the problem?

 

sounds like the sending unit inside the tank is not moving freely or perhaps there's a dirty electrical contact. I believe the sending unit is built into the fuel pump on the C70s so you'd have to pull out the pump to check it out...