F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/20
F02M 33/02 (2006.01) F02M 25/08 (2006.01) F02M 37/20 (2006.01)
Patent
CA 1090664
FUEL TANK VAPOR FLOW CONTROL VALVE -- Abstract of the Disclosure -- In an evaporative emission control system for a vehicle, the flow of fuel vapor from the fuel tank to the vapor storage canister in the system is controlled by a vapor flow control valve having a housing with a chamber therein in flow communication with the fuel tank to receive fuel vapor therefrom this chamber being connected to the vapor storage canister by a first vapor passage means and by a second vapor passage means, with flow from the chamber through the first vapor passage means being controlled by a diaphragm valve means that is normally biased closed by a spring, and which is respon- sive to either engine vacuum on one side thereof or to a predetermined fuel vapor pressure on its opposite side whereby to permit vapor flow and, the second vapor passage means including a sized bleed orifice passage used to control the rate of vapor flow to the storage canister via this second vapor passage means.
312977
General Motors Corporation
Gowling Lafleur Henderson Llp
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