| 摘要 |
An apparatus to control the flow of hydrocarbon fuel vapor from a vehicle fuel tank. The apparatus is mounted adjacent the top of the fuel tank and contains a valve system which controls fuel vapor flow from the tank to a receiving canister and prevents the vapor from escaping to the atmosphere. The valve system utilizes a diaphragm, operably connected to a main valve, to prevent the vapor pressure in the fuel tank from closing the valve. The main valve is actuated by a float responsive to the level of fuel in the tank and remains open when the fuel level is below a designated level and closes due to a sufficiently high fuel level or in a vehicle roll-over condition to prevent liquid fuel from escaping from the fuel tank through the apparatus.
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