초록 ▼

A fuel cap includes a float valve assembly for minimizing discharge of liquid fuel splash from the filler neck through the pressure-relief vent passage during normal vehicle operation. The float valve assembly is compatible with a controllable pressure-relief valve in the cap that permits venting of

A fuel cap includes a float valve assembly for minimizing discharge of liquid fuel splash from the filler neck through the pressure-relief vent passage during normal vehicle operation. The float valve assembly is compatible with a controllable pressure-relief valve in the cap that permits venting of the tank under normal conditions and controls fuel leakage from the cap during a roll-over condition.

대표청구항 ▼

A fuel cap for use in a vehicle fuel system filler neck having a mouth, the cap comprising closure means for engaging the filler neck to close the mouth of the filler neck, the closure means being formed to include means for conducting fuel vapor from the filler neck to the atmosphere upon engagemen

A fuel cap for use in a vehicle fuel system filler neck having a mouth, the cap comprising closure means for engaging the filler neck to close the mouth of the filler neck, the closure means being formed to include means for conducting fuel vapor from the filler neck to the atmosphere upon engagement of the closure means and the filler neck, and means in the conducting means for normally blocking flow of fuel vapor therethrough from the filler neck to the atmosphere, the blocking means including a pressure-relief valve movable between conducting means-opening positions and a conducting means-closing position, the closure means including means for selectively establishing fluid communication of fuel vapor in the filler neck with the pressure-relief valve to permit superatmospheric fuel vapor in the filler neck to exert a closure-inducing force on the pressure-relief valve sufficient to move the pressure-relief valve to its conducting means-closing position while said superatmospheric fuel vapor is extant in the conducting means.