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 5/08 (2006.01) F02M 25/08 (2006.01)
Patent
CA 1074638
BALANCE TUBE FUEL BOWL VENT SYSTEM -- Abstract of the Disclosure -- As part of an evaporative emission control system for an automotive vehicle, the fuel bowl of the carburetor for the internal combustion engine of the vehicle is provided with an internal vent passage for venting fuel vapor from the fuel bowl to the air cleaner, for example, for induction through the in- duction passage in the carburetor for flow to the engine during engine operation and, with an external vent passage for venting fuel vapor from the fuel bowl to a vapor storage canister when the engine is not in operation, as during hot soak, the internal vent passage having a cross sectional flow area at least two times larger than the minimum cross sectional flow area of the external vent passage whereby changes in pressure at the canister will tend to result in air cleaner depression changes with minimal differential pressures between the carburetor fuel bowl and air cleaner.
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