A filler neck closure assembly for a vehicle fuel tank filler neck, comprising: a housing configured to be mounted in the filler neck and formed to include a sealing surface and a pressure-relief valve positioned to lie in the housing and provided with a nozzle-receiving portion and a sealing portio
A filler neck closure assembly for a vehicle fuel tank filler neck, comprising: a housing configured to be mounted in the filler neck and formed to include a sealing surface and a pressure-relief valve positioned to lie in the housing and provided with a nozzle-receiving portion and a sealing portion, wherein the nozzle-receiving portion is formed to include a nozzle-receiving opening sized to receive a pump nozzle during refueling of the fuel tank and the sealing portion is movable with the nozzle portion and relative to the housing between a closure-sealing position sealingly engaging the sealing surface and a pressure-relief position away from the sealing surface to define an opening to vent fuel vapor from the fuel tank when tank pressure exceeds a predetermined maximum pressure. The housing is formed to include a passageway containing the pressure-relief valve therein and defines an annular space around the pressure-relief valve, between the pressure-relief valve and the housing, and with a coiled compression spring positioned in the annular space, the pressure-relief valve including an axially outwardly extending annular guide wall adjacent to the annular space which defines a radially inner side of the annular space, the housing further including a radially inwardly extending annular lip wherein the guide wall slidingly engages the lip of the housing to radially guide the pressure-relief valve during movement of the pressure-relief valve between the closure-sealing position and the pressure-relief position.
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[ I claim:] [1.] A filler neck closure assembly for a vehicle fuel tank filler neck, the assembly comprisinga closure for closing the filler neck, the closure including a housing formed to include an interior region for receiving fuel vapor in the filler neck and a vent aperture for discharging fuel
[ I claim:] [1.] A filler neck closure assembly for a vehicle fuel tank filler neck, the assembly comprisinga closure for closing the filler neck, the closure including a housing formed to include an interior region for receiving fuel vapor in the filler neck and a vent aperture for discharging fuel vapor from the interior region, closure retainer apparatus appended to the housing and configured to engage the filler neck when the housing is installed in the filler neck to block removal of the closure from the filler neck, a seal member engaging the housing and lying in a position to engage the filler neck to establish a sealed connection between the housing and the filler neck when the housing is installed in the filler neck, and a movable tank pressure control assembly mounted for movement in the interior region of the housing between a filler neck-closing position blocking discharge of fuel vapor in the filler neck through the vent aperture and a filler neck-venting position allowing discharge of fuel vapor in the filler neck through the vent aperture, the movable tank pressure control assembly including a nozzle-receiving opening and a door mechanism normally closing the nozzle-receiving opening. [33.] A filler neck closure assembly for a vehicle fuel tank filler neck, the assembly comprisinga housing configured to mount in the filler neck and formed to include a sealing surface, anda pressure-relief valve positioned to lie in the housing, the pressure-relief valve including a nozzle-receiving portion and a sealing portion, the nozzle-receiving portion being formed to include a nozzle-receiving opening sized to receive a pump nozzle during refueling of the fuel tank the sealing portion being movable relative to the housing between a closure-sealing position sealingly engaging the sealing surface and a pressure-relief position away from the sealing surface to define an opening therebetween to vent fuel vapor from the fuel tank when tank pressure exceeds a predetermined maximum pressure, the nozzle-receiving portion moving axially with the sealing portion during movement of the sealing portion between the closure-sealing position and the pressure-relief position, and wherein the housing is formed to include a passageway extending therethrough and containing the pressure-relief valve therein, the housing and the pressure-relief valve cooperate to define an annular space around the pressure-relief valve and between the pressure-relief valve and the housing, and a coiled compression spring is positioned in the annular space, the pressure-relief valve includes an axially outwardly extending annular guide wall adjacent to the annular space and the guide wall defines a radially inner side of the annular space, the housing further includes a radially inwardly extending annular lip appended to the housing and the guide wall slidingly engages the lip of the housing to radially guide the pressure-relief valve during movement of the pressure-relief valve between the closure-sealing position and the pressure-relief position. [44.] A filler neck closure assembly for a vehicle fuel tank filler neck, the assembly comprisinga housing configured to mount in the filler neck and formed to include an interior region and a sealing surface,a pressure-relief valve positioned to lie in the interior region of the housing, the pressure-relief valve being movable relative to the housing between a closure-sealing position sealingly engaging the sealing surface and a pressure-relief position away from the sealing surface to define an opening therebetween to vent fuel vapor from the fuel tank when tank pressure exceeds a predetermined maximum pressure, andan outer shell mounted on the housing for rotation about an axis passing through the interior region formed in the housing, the outer shell including a side wall and a front wall cooperating with the side wall to define an enclosed space receiving an axially outer portion of the pressure-relief valve when the pressure-relief valve is in the pressure-relief position. [58.] A filler neck closure assembly for a vehicle fuel tank filler neck, the assembly comprisinga housing configured to be received by the filler neck,a sealing gasket positioned to lie between the housing and the filler neck, the sealing gasket being subject to damage due to overtightening of the closure assembly on the filler neck,an outer shell rotatably connected to the housing, the outer shell being formed to include a nozzle-receiving opening, anda torque-override mechanism for providing a torque-limited connection between the outer shell and the housing to protect the gasket from over tightening of the closure assembly on the filler neck resulting from the application of torque above a predetermined maximum torque on the outer shell, the torque-override mechanism including drive teeth appended to the outer shell.
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