Abstract: A valve assembly is disclosed for controlling fluid flow between two reservoirs. The valve assembly includes a relief valve arranged inside the housing and configured to open a first fluid flow path when the first reservoir is above a first predetermined pressure value.

Abstract: A vent valve comprising an outer sleeve including a vent window; a housing disposed within the outer sleeve, the housing including a vent slot; a baffle disposed in front of the vent slot. Embodiments of the invention may include a float disposed within the outer sleeve, a flapper disposed within the outer sleeve, an end cap, and/or a venting orifice. In an embodiment the vent window and the vent slot may oppose one another and can, for instance, be positioned approximately 180° apart.

Abstract: A vapor vent/tipping valve has a diaphragm with a bleed therethrough responsive to the differential pressure of bleed flow to control vapor venting to the canister and vapor recirculation to the filler tube. A dip tube causes rising fuel in the tank to close the dip tube and prevent vapor flow to the diaphragm bleed thereby starving the recirculation line and allowing nozzle discharge to create a vacuum in the filler and effect nozzle shutoff. Alternatively, float operated shutoff valves may be employed in the dip tube and vapor vent chamber inlet, the shutoff valves may include inertial members for closing the float valves to afford tipping/rollover protection.

Abstract: A vehicle refueling system and a vehicle refueling method are disclosed. The refueling system includes a filler cup, a nozzle seal in the filler cup for sealing to a filler nozzle, a vapor re-circulation path from the gas tank to the filler cup, and an air relief module. The air relief module provides additional air to the filler cup region below the nozzle seal when the vapor re-circulation path does not provide sufficient make-up air to the filler nozzle during refueling operations. The refueling method includes providing air through an air relief module when the vapor flow through the vapor re-circulation path is not sufficient to perform a refueling operation.