Patent ID: 8807160

Claim:
A marine vessel fuel system comprising: a fuel container housed within a marine vessel, the fuel container defining an interior and an exterior; a fuel-intake port located at a fuel-intake opening defined by a top surface of the fuel container and near a center of the top surface of the fuel container, the fuel-intake port passing from the exterior to the interior of the fuel container and having a diameter; and a fuel shut-off valve located at the fuel-intake port and having at least a portion within the interior of the fuel container, the fuel shut-off valve having: a chamber having a first end defining the fuel-intake opening at the top surface of the fuel container, a second end opposite the first end, and a length between the first end and the second end; and a fuel shut-off valve stopper: having a buoyancy when placed in liquid; having at least a portion located within the chamber; movable along the length of the chamber from the fuel-intake opening at the first end of the chamber to the second end of the chamber; and sized and configured to seal the fuel-intake opening at the top surface of the fuel container when the fuel shut-off valve stopper is moved, by a buoyance force of liquid within the chamber, to the fuel-intake opening; wherein the fuel shut-off valve is adapted to remain in an unsealed configuration until liquid in the fuel container reaches a predetermined capacity.