Carburetor with fuel bowl evaporation control means

Claim 2

In a carburetor for an internal combustion engine, a fuel bowl housing defining a chamber, said chamber adapted to be partially filled with liquid fuel, said housing having vent means formed therethrough above the level of the fuel for admitting atmospheric pressure to said chamber, a float member partially submerged and floating in said fuel, and impervious means surrounding said float member and adapted to be in contact with and float on the surface of said fuel and being coextensive with the surface area of said fuel to prevent the passage of evaporated fuel through said vent means.

Claim 3

In a carburetor for an internal combustion engine, a fuel bowl housing defining a chamber, said chamber adapted to be partially filled with a variable volume of liquid fuel, said housing having vent means formed therethrough above the maximum level of the fuel for admitting atmospheric pressure to said chamber, a float member adapted to be partially submerged and float in said fuel, said float member having a horizontally cross-sectional area less than the horizontal cross-sectional area of said chamber, and impervious means fixedly secured to said housing having a horizontal portion coextensive with the surface area of said fuel surrounding said float member, said horizontal portion being positioned at the maximum horizontal level of said fuel, said impervious means having a depending portion adjacent said float and spaced from said housing.

Claim 4

In a carburetor for an internal combustion engine, a fuel bowl housing defining a chamber, said chamber adapted to be partially filled with a variable volume of liquid fuel, said housing having vent means formed therethrough above the maximum level of the fuel for admitting atmospheric pressure to said chamber, a float member adapted to be partially submerged and float in said fuel, said float member having a horizontally cross-sectional area less than the horizontal cross-sectional area of said chamber, and impervious means fixedly secured to said housing having a horizontal portion coextensive with the surface area of said fuel surrounding said float member, said horizontal portion being positioned at the maximum horizontal level of said fuel, said impervious means having a depending portion adjacent said float and spaced from said housing.

Claim 5

In a carburetor for internal combustion engine, a fuel bowl housing defining a chamber, said chamber adapted to be partially filled with liquid fuel, said housing having vent means formed therethrough above the level of the fuel for admitting atmospheric pressure to said chamber, a float member partially submerged and floating in said fuel, and impervious means surrounding said float member and coextensive with the surface area of said fuel to prevent the passage of evaporated fuel through said vent means, said impervious means comprising a flexible gasket adapted to float on the surface of said fuel.

Claim 6

In a carburetor for internal combustion engine, a fuel bowl housing defining a chamber, said chamber adapted to be partially filled with liquid fuel, said housing having vent means formed therethrough above the level of the fuel for admitting atmospheric pressure to said chamber, a float member partially submerged and floating in said fuel, and impervious means surrounding said float member and coextensive with the surface area of said fuel to prevent the passage of evaporated fuel through said vent means, said impervious means comprising a flexible gasket adapted to float on the surface of said fuel.

Claim 7

In a carburetor for an internal combustion engine according to claim 3, said gasket being unitary with said float member.

Claim 8

In a carburetor for an internal combustion engine according to claim 3, said impervious means comprising a flexible gasket unattached to said float member, and adapted to float on the surface of said fuel.