Today, I took the time to fill my LSV up with a gas can. At about the 3/4 tank level, the gas would start coming up the fuel hose, and slowly go down. After about 6 more gallons, the gas was at the top of the fuel hose and stopped dropping. I turned the key on, and the fuel gauge read just over a full tank. I believe the new vent system cannot keep up with the fill, and that is why we can only get 3/4 of a tank at the gas station.