Patent ID: 6918405

Claim:
A fill limit vent valve assembly for attachment in an aperture of a fuel tank wall, the fill limit vent valve assembly comprising: a cap member having a nozzle and a cage, the nozzle defining a vapor-inlet opening, a passageway and a vapor-outlet opening, the passageway interconnecting the vapor-inlet opening and the vapor-outlet opening; a carrier stage including a carrier and a sealing element attached to the carrier, the sealing element defining a first seal and a second seal disposed proximate each other, the first seal having a first orifice disposed therein, the second seal having a second orifice disposed therein, the first and second orifices in communication with each other, the first orifice having a first diameter smaller than a second diameter of the second orifice, the carrier configured for axial movement in the cage for engagement of the second seal about the vapor-inlet opening; a float stage movably connected to the carrier stage, the float stage including a pivot pin and a float defining a stem, the pivot pin movably disposed on the stem, the sealing element spaced apart from the pivot pin and the vapor-inlet opening in a first valve assembly condition for substantially unrestricted vapor venting; and a valve housing attachable to the cap member, the valve housing at least partially disposed within an interior of a fuel tank, the valve housing defining a cavity therein and configured to house the carrier and float stages, the valve housing including a window and a guide channel, the window configured to pass a liquid fuel into the cavity to actuate the float stage such that the pivot pin contacts the first seal to reduce a fuel vapor vent rate in a second valve assembly condition and to limit a fuel level in the fuel tank in a third valve assembly condition, the cage and the guide channel cooperable to control displacement of the float.