Vehicle refueling valve

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

Patent

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Details

137587, 137110, F02M 3704

Patent

active

056693613

ABSTRACT:
A refueling valve for a motor vehicle includes an integrated control valve therein having a vent tube that has a first valve seat on one end thereof and a second valve seat on the other end thereof that cooperate respectively with a float valve and with a diaphragm controlled pressure responsive cut-off valve that is operative in accordance with a sensed pressure condition in a fuel filler pipe to control fuel venting to a charcoal canister and to prevent the escape of fuel vapors from a filler neck. The diaphragm is communicated with a pressure sensing port in the filler neck below a trap door therein that opens during refueling and is closed once the fuel nozzle is removed. The pressure sensing pot is located upstream of a venturi that produces negative pressure at the pressure sensing port and on the diaphragm member. A spring biases the cut-off valve normally closed. The diaphragm is responsive to a reduced pressure condition in the filler neck to open the cut-off valve to allow vapors to be vented from the fuel tank to the charcoal canister during refueling.

REFERENCES:
patent: 4768566 (1988-09-01), Ito
patent: 4796593 (1989-01-01), Woodcock
patent: 4974645 (1990-12-01), Johnson
patent: 5014742 (1991-05-01), Covert
patent: 5065782 (1991-11-01), Szlaga
patent: 5183087 (1993-02-01), Aubel
patent: 5282497 (1994-02-01), Allison
patent: 5318069 (1994-06-01), Harris
patent: 5460135 (1995-10-01), Ohashi
patent: 5474048 (1995-12-01), Yamazaki
patent: 5497800 (1996-03-01), Ohashi

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