Evaporation Control System: Description

The purpose of the Evaporation Control System is to prevent the emissions of gasoline vapors from the fuel tank and carburetor into the atmosphere. When fuel evaporates in the carburetor float chamber or fuel tank, the vapors pass through vent hoses or tubes to a charcoal canister. They are stored here until drawn into the intake manifold after engine begins to run. See Figureand Figure.