Outer vent control device for a carburetor

An outer vent control device for use between a carburetor of an engine including a float chamber having an outer wall defining an outer vent port therein and a canister through an outer vent line for delivering fuel vapor from the float chamber to the canister, said outer vent control device comprising:

• a valve housing adapted to be attached to the outer wall of the float chamber in thermally conductive relation, said valve housing having an inlet port adapted to communicate with the outer vent port and an outlet port adapted to communicate with the outer vent line;
• a first control valve disposed in said valve housing and openable when the engine stops its operation;
• and
• a second thermosensitive control valve disposed in said valve housing and closable when the temperature of the float chamber drops below a preset temperature, said valve housing being an elongate tubular shape having said inlet port in an upper portion thereof and said outlet port in a lower portion thereof, said first control valve being disposed in said upper portion of the valve housing, said second thermosensitive control valve being disposed in said lower portion of the valve housing, said second thermosensitive control valve including a thermosensitive unit on a lower end thereof and a cover attached to said valve housing in covering relation to said thermosensitive unit.