Fill neck assembly for vehicle mounted fuel vapor recovery syste

Fluent material handling – with receiver or receiver coacting mea – Diverse fluid containing pressure filling systems involving... – Filling with exhausting the receiver

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141 44, 141286, 141291, 141302, 137588, 220 85VR, 220 85VS, 220 86R, 220DIG33, 55387, 123519, B65B 3106

Patent

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049324446

ABSTRACT:
An onboard fuel vapor recovery system for a motor vehicle includes a fill neck assembly mounted at the inlet end of a dual passage fuel tank fill pipe in which fuel dispensed into the fuel tank during a refueling operation passes through an inner conduit while fuel vapor displaced from the tank by incoming fuel passes upwardly through a vapor passage between the inner conduit and an outer conduit loosely surrounding the inner conduit, the fill neck assembly including a vapor valve movable to an open position in response to unsealing of the inlet to the inner conduit in preparation for a refueling operation, opening of the vapor valve permitting fuel vapor displaced from the tank during the refueling operation to flow into a vapor receiving canister from which the vapor is subsequently withdrawn for combustion in the vehicle engine, the fill neck assembly also including a float valve for signalling the filling of the tank to capacity and a pressure relief valve in the fill neck assembly protecting the system in emergency overfilling situations.

REFERENCES:
patent: 4564054 (1986-01-01), Gustavsson
patent: 4630749 (1986-12-01), Armstrong et al.
patent: 4706708 (1987-11-01), Fornuto et al.
patent: 4707164 (1987-11-01), Harris
patent: 4714172 (1987-12-01), Morris
patent: 4715509 (1987-12-01), Ito et al.
patent: 4724861 (1988-02-01), Covert et al.
patent: 4742809 (1988-05-01), Ito et al.
patent: 4747508 (1988-05-01), Sherwood

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