| 主权项 |
1. A fuel vapor transfer system comprising
a filler-neck closure including a closure body adapted to be extended into a fuel-conducting passageway formed in a fuel-tank filler neck, the closure body being formed to include a vent aperture adapted to communicate with the fuel-conducting passageway formed in the fuel-tank filler neck when the closure body is mounted on the fuel-tank filler neck, the closure body also being formed to include an interior chamber arranged to lie in fluid communication with the vent aperture formed in the closure body, the filler-neck closure also including an upper O-ring seal arranged to surround and mate with the closure body and adapted to mate with the fuel-tank filler neck and cooperate with the closure body to close a filler-neck mouth opening into the fuel-conducting passageway formed in the fuel-tank filter neck and a vacuum-relief valve mounted in the closure body for movement relative to the closure body from a normally closed position blocking flow of pressurized fuel vapor extant in the fuel-tank filler neck through the vent aperture into the interior chamber of the closure body to an opened position allowing flow of air from the atmosphere into the fuel-tank filler neck in response to exposure of the vacuum-relief valve to fuel vapor extant in the fuel-tank filler neck and characterized by negative pressure in excess of a predetermined negative pressure, a closure cover arranged to overlie the filler-neck closure and to be gripped by a user and supported for movement relative to the filler-neck closure, and a valve mover coupled to the vacuum-relief valve and arranged to move the vacuum-relief valve from the normally closed position to the opened position in response to movement of the closure cover relative to the filler-neck closure, wherein the closure body also includes a side wall adapted to be surrounded by an interior surface of the fuel-tank filler neck when the closure body mates with the fuel-tank filler neck and the side wall of the closure body is formed to include a vent channel having a channel inlet opening into the interior chamber formed in the closure body and a channel outlet adapted to open into the fuel-conducting passageway formed in the fuel-tank filler neck when the closure body and the upper O-ring seal mate with the fuel-tank filler neck to close the filler-neck mouth opening into the fuel-conducting passageway formed in the fuel-tank filler neck. |
