Evaporative Emissions System: Description and Operation

Evaporative Emissions Control System Schematic:

The evaporative emission control system used on this vehicle is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon storage canister to retain the vapors when the vehicle is not operating. When the engine is running the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.

Vapor Canister - Two Tube:

OPERATION
This system uses a two tube canister. The fuel vapors vent from the fuel tank to the tank tube of the canister. A ported vacuum source controls the canister purge. The vapors are purged when the engine is running above idle speed.