Tank mounted valve for fuel vapor recovery system

Details Tank mounted valve for fuel vapor recovery system Tank mounted valve for fuel vapor recovery system

1987-10-16

1989-01-10

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123516, 123520, F02M 3900

Patent

active

047965932

ABSTRACT:
An onboard fuel vapor recovery system for a motor vehicle includes a pressure responsive valve mounted directly on the vehicle fuel tank to control the flow of fuel vapor from the tank to a vapor storage canister both during normal operation of the vehicle and during a vehicle refueling operation. A pressure responsive diaphragm in the tank mounted valve opens a substantially unrestricted vapor flow passage from the head space of the tank to the canister when the head space pressure slightly exceeds atmospheric pressure. A separate passage in the tank valve equalizes pressure in the tank head space upon the withdrawal of fuel. A float valve responsive to the level of fuel within the tank seals the vapor passage from the tank head space when the tank is filled with fuel and further incorporates an emergency tank pressure relief valve operable in the event of overfilling of the tank.

REFERENCES:
patent: 3302658 (1967-02-01), DeFrees
patent: 3606908 (1971-09-01), Riester
patent: 3610221 (1971-10-01), Stoltman
patent: 3616783 (1971-11-01), Masters
patent: 3617034 (1971-11-01), Skinner
patent: 3662725 (1972-05-01), Dragon
patent: 3703165 (1972-11-01), Hansen
patent: 3957025 (1976-05-01), Heath
patent: 4178894 (1979-12-01), Nay
patent: 4646701 (1987-03-01), Fukumoto

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