System utilizes a carbon canister that is connected to both the
engine vacuum line and the air space in the fuel tank. the carbon canister collects fuel vapors from the fuel
tank during storage and operation. when the engine is operating, intake vacuum draws the fuel vapors from
the carbon canister into the engine intake system and the engine consumes them.
low vacuum evaporative
high vacuum evaporative
passive evaporative
high or low vacuum active evaporative