초록 ▼

A system to collect and control the flow of fuel vapor within a vehicle fuel system. In one embodiment, a vapor control unit mounted in the fuel tank permits fuel vapor to be drawn into a tank fill pipe when liquid fuel is being added to the fuel tank to condense at least a portion of the fuel vapor

A system to collect and control the flow of fuel vapor within a vehicle fuel system. In one embodiment, a vapor control unit mounted in the fuel tank permits fuel vapor to be drawn into a tank fill pipe when liquid fuel is being added to the fuel tank to condense at least a portion of the fuel vapor. In a second embodiment a diaphragm actuated valve permits fuel vapor flow from the fuel tank into the tank fill pipe when liquid fuel is being added to the tank to condense at least a portion of the fuel vapor. By condensing the fuel vapor the system reduces the total amount of fuel vapor within the fuel system while preventing the escape of fuel vapor which is hazardous to the environment.

대표청구항 ▼

[ We claim:] [1.] A fuel system comprising:a fuel tank;an inlet to the fuel tank;a fill pipe communicating at one end with the inlet of the fuel tank and having a fill pipe inlet adjacent the other end and spaced vertically above the top of the fuel tank;a normally open vapor control valve communica

[ We claim:] [1.] A fuel system comprising:a fuel tank;an inlet to the fuel tank;a fill pipe communicating at one end with the inlet of the fuel tank and having a fill pipe inlet adjacent the other end and spaced vertically above the top of the fuel tank;a normally open vapor control valve communicating with the fuel tank adjacent the top of the fuel tank and constructed and arranged to close when the level of liquid fuel in the tank is immediately adjacent the top of the tank; anda vapor conduit communicating the vapor control valve with the fill pipe adjacent to and downstream of its inlet whereby vapor within the fuel tank is forced through the control valve and vapor conduit and directly into the fill pipe when fuel is being added to the tank through the fill pipe to entrain the fuel vapor in the fuel flowing through the fill pipe and condense at least some of the fuel vapor.