Patent ID: 7568494

Claim:
A vent apparatus to be located in a fuel tank to regulate discharge of fuel vapor from the tank to a destination outside of the tank, the vent apparatus comprising a fill-limit vent valve adapted to be mounted in the tank and having a venting outlet adapted to be connected to a vent outlet of the tank and a flow port, the fill-limit vent valve being responsive to fuel level in the tank to open and allow venting of vapor in the fuel tank through the venting outlet until a predetermined liquid fuel level in the fill-limit vent valve is reached, a control valve connected to the flow port of the fill-limit vent valve and having a fuel port receiving fuel from the tank and a drain port draining fuel, and an actuator coupled to the control valve to provide a first control signal causing the control valve to move to a fuel-delivery position during refueling of the fuel tank to block the drain port and to open the fuel port to deliver liquid fuel from the tank to the fill-limit vent valve allowing discharge of tank fuel vapor from a vapor space in the tank to the fill-limit vent valve module until the fuel level closes the fill-limit vent valve, and to provide a second control signal after refueling causing the control valve to move to a fuel-shutoff position to block further flow of liquid fuel from the fuel tank to the fill-limit vent valve module and to open the drain port to drain liquid fuel from the fill-limit vent valve module into the fuel tank to allow the fill-limit vent valve to open.