Fill limit valve assembly

An apparatus for controlling discharge of fuel vapor from a vehicle fuel tank having a filler neck provided with an inlet mouth for receiving a fuel-dispensing nozzle therein, the apparatus comprising

• means adapted for venting fuel vapor from a vapor space in the fuel tank above liquid fuel contained in the fuel tank to an outside space,
• primary shut-off means adapted for using rising liquid fuel in the fuel tank introduced into the fuel tank during refueling to block fuel vapor in the vapor space in the fuel tank from entering the venting means so that tank pressure in the vapor space in the fuel tank rises to exceed a predetermined pressure to push liquid fuel through the filler neck toward the inlet mouth to reach and shut off a fuel-dispensing nozzle inserted into the filler neck, and
• secondary shut-off means adapted for blocking flow of fuel vapor from the fuel tank through the venting means, the secondary shut-off means including a valve housing coupled to the venting means and formed to include a vapor inlet opening adapted for receiving fuel vapor from the fuel tank and a passageway interconnecting the vapor inlet opening and the venting means, the secondary shut-off means further including a float valve disposed in the valve housing and movable between an open position allowing flow of fuel vapor through the venting means and a closed position preventing flow of fuel vapor through the venting means.

An apparatus for controlling discharge of fuel vapor from a vehicle fuel tank, the apparatus comprising

• a valve housing adapted to be mounted in a top wall of the fuel tank, the valve housing being formed to include a vapor inlet opening adapted to communicate with an interior region of the fuel tank, a vapor outlet opening, and a passageway interconnecting the vapor inlet opening and the vapor outlet opening,
• a float valve disposed in the valve housing and movable between an open position allowing flow of fuel vapor through the vapor outlet opening and a closed position preventing flow of fuel vapor through the vapor outlet opening, and
• a skirt adapted to lie inside the fuel tank and extend around the valve housing and the vapor inlet opening in the valve housing to define an annular channel adapted to lie around the valve housing and conduct fuel vapor from the interior region of the fuel tank to the vapor inlet opening, the skirt having a bottom edge adapted to lie in spaced-apart relation to the top wall of the fuel tank to locate the vapor inlet opening in the valve housing in a position between the top wall of the fuel tank and the bottom edge, the skirt being formed to include an opening adjacent to the bottom edge and a ceiling defining the upper boundary of the opening, the ceiling being positioned to lie in coextensive relation with a top surface of liquid fuel in the interior region of the fuel tank once the volume of liquid fuel in the fuel tank is equal to a predetermined maximum fuel capacity of the fuel tank.