Evaporative Emission System

The evaporative-emission control system consists of a carbon canister, into which a fuel vapor line is connected from the top of the fuel tank, as well as an EVAP Canister Purge Regulator Valve that is controlled by the ECM. The EVAP Canister Purge Regulator Valve connects to both the carbon canister and the intake manifold. The ECM controls the purged-gas vapor volume based on the engine operating point. Purging and regeneration must be performed regularly to ensure that the carbon canister is always ready to accept and absorb fuel vapor.

The activated carbon absorbs the fuel contained in the fuel vapor and allows only air to escape to the atmosphere. When the canister-purge valve frees up the line between the carbon canister and the intake manifold, fresh air is drawn through the activated carbon by the vacuum prevailing in the intake manifold. The fresh air picks up the absorbed fuel and feeds it back into the Intake manifold and used through combustion process.