Evaporative Emissions System: Description and Operation

DESCRIPTION
A duty cycle purge system is used. The PCM controls vapor flow by operating the duty cycle EVAP purge solenoid. The EVAP canister is used for the storage of fuel vapors from the fuel tank.

OPERATION
The function of the EVAP control system is to prevent the emissions of gasoline vapors from the fuel tank into the atmosphere. When fuel evaporates in the fuel tank, the vapors pass through vent hoses or tubes to a carbon filled EVAP canister. They are temporarily held in the canister until they can be drawn into the intake manifold when the engine is running.

NOTE: The hoses used in this system are specially manufactured. If replacement becomes necessary, it is important to use only fuel resistant hose.