Evaporative Emission Control Canister: Description and Operation

Evaporative emissions canister
A maintenance free, EVAP canister is used on the Rio located under the right side of the vehicle near the fuel tank. The EVAP canister is filled with granules of an activated carbon mixture. Fuel vapors enter into the EVAP canister are absorbed by the charcoal granules. Fuel tank pressure vents into the EVAP canister and are temporarily held in the canister until they can be drawn into the intake manifold.