Patent ID: 8807162

Claim:
A fuel system comprising: a fuel container housed within a marine vessel, the fuel container defining an interior, an exterior, a fuel-intake opening, and an opening, the fuel-intake opening and the opening of the fuel container placing the interior in fluid communication with the exterior, the fuel-intake opening located on a top surface of the fuel container; a fuel shut-off valve at the fuel-intake opening and having at least a portion within the interior of the fuel container; and an emission assembly located within the interior of the fuel container, the emission assembly having: a passageway having a watertight length and at least a first opening and a second opening along the watertight length, the first opening of the passageway having a mechanical watertight couple to the opening of the fuel container; a first chamber having a first end coupled to the second opening of the passageway, a second end opposite the first end of the first chamber, and a length between the first end of the first chamber and the second end of the first chamber; a first stopper: having a buoyancy when placed in liquid; having at least a portion located within the first chamber; movable along the length of the first chamber; and sized to seal the second opening of the passageway when at the first end of the first chamber; and a third opening in the passageway and a fourth opening in the passageway, the second opening located between the third and fourth openings, the fuel shut-off valve disposed between the third and fourth openings.