Evaporative Emissions System: Operation

Expanded fuel, caused by high ambient temperatures, is collected in the expansion tank. This fuel will be returned to the main tank by venting action as fuel is used from the main tank. Fuel vapors produced in the main tank or expansion tank pass through a vent line to a carbon canister (located in engine compartment) where they are absorbed by activated charcoal. A second vent line connects the carbon canister to the carburetor air cleaner. When the engine is running, intake manifold vacuum draws fresh air through the carbon canister. This fresh air mixes with the fuel vapors and is drawn into the carburetor where it enters the combustion system and is burned. This action purges the activated charcoal and renews its storage capacity.