Evaporative Emission Control System: Components: Notes

Fig 1: Evaporative Emission Control System Diagram

Courtesy of KIA MOTORS AMERICA, INC.

When the fuel evaporates in the fuel tank, the vapor passes through vent hoses or tubes to EVAP. canister filled with charcoal and the EVAP. canister temporarily holds it with charcoal. If ECM wants to draw the gathered vapor into the combustion chambers during certain operating conditions, it will make vacuum in intake manifold to move it.