Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1996-02-15
1997-09-23
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
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.
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Baron Tibor
Rosas Manuel D.
Weissinger Peter G.
Borg-Warner Automotive Inc.
Dziegielewski Greg
Miller Carl S.
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