Evaporation Control System
The evaporation control system prevents emission of fuel tank vapors into atmosphere. When fuel evaporates in fuel tank, vapors pass through vent hoses or tubes to an activated carbon filled evaporative canister. The canister temporarily holds vapors. The Powertrain Control Module (PCM) allows intake manifold vacuum to draw vapors into combustion chambers during certain operating conditions.
All engines use a duty cycle purge system. The PCM controls vapor flow by operating duty cycle EVAP purge solenoid.
NOTE:
The evaporative system uses specially manufactured hoses. If they need replacement, use only fuel resistant hose. Also hoses must be able to pass an Ozone compliance test.