Vent control valving for fuel vapor recovery system

Details Vent control valving for fuel vapor recovery system Vent control valving for fuel vapor recovery system

1995-11-29

1998-09-22

Miller, Carl S.

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

137 43, 137 39, F02M 3704

Patent

active

058099760

ABSTRACT:
Vent control valving is described for an automotive fuel vapor recovery system, in which a baffle arrangement prevents or otherwise restricts liquid fuel from entering a vent passage to a charcoal canister. A sealing arrangement prevents or otherwise restricts the escape of fuel when the vehicle is turned at a sufficient rate of turn, operated on a sufficient incline, or rolled over, and prevents overfilling of the tank, which could allow liquid fuel to enter the vent passage. In one embodiment, a differential pressure is developed across a diaphragm during refueling which unseats the diaphragm from a seat to allow unrestricted venting during refueling, restricted venting is established whenever the diaphragm is seated to limited the flow of vapors to the canister.

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