초록 ▼

A refueling fuel level responsive control valve with a two-stage closing operation providing an initial soft shutoff cue to the filler nozzle operator, and a subsequent final shutoff after a limited amount of "roundoff" filling to a maximum fuel level. The control valve includes two float-operated v

A refueling fuel level responsive control valve with a two-stage closing operation providing an initial soft shutoff cue to the filler nozzle operator, and a subsequent final shutoff after a limited amount of "roundoff" filling to a maximum fuel level. The control valve includes two float-operated valve elements which close serially in response to initial shutoff and final shutoff refueling fuel levels. The initial shutoff partially closes the control valve to create a temporary shutoff-inducing increase in fuel tank pressure. Final shutoff occurs after allowing a few round-off "clicks" of the filler nozzle to fully close venting through the control valve.

대표청구항 ▼

[ We claim:] [1.] A fuel level responsive control valve for controlling the venting of fuel vapor from a vehicle fuel tank to a vapor canister during refueling in a manner providing a shutoff cue to a person filling the tank, the control valve comprising:a valve adapted for venting fuel vapor from t

[ We claim:] [1.] A fuel level responsive control valve for controlling the venting of fuel vapor from a vehicle fuel tank to a vapor canister during refueling in a manner providing a shutoff cue to a person filling the tank, the control valve comprising:a valve adapted for venting fuel vapor from the tank to the canister at a first higher rate when the fuel level is below an initial refueling shutoff level, at a second lower rate when the fuel level reaches the initial refueling shutoff level such that a shutoff-inducing pressure increase is temporarily created in the tank, and for closing when a higher maximum refueling shutoff level is reached.