Evaporative Emissions System: Description and Operation

Canister Purge Operation:

CONSTRUCTION
The system consists of a non-vented fuel tank, a special Fuel Filler Cap, Charcoal Canister, Rollover / Pressure Relief Valve, Purge Control Valve, Air Cleaner Venturi, and hoses necessary to connect these components together.

OPERATION
The evaporative emission system prevents gasoline vapors in the fuel system from escaping into the atmosphere. When the vehicle is not running, fuel in the fuel tank evaporates. The vapors travel through vent hoses or tubes to be stored in the charcoal canister. Once the vehicle is running, these vapors are drawn into the engine and consumed with combustion gases.