The Evaporative
Emission Control System prevents fuel vapor stored in fuel tank from
vaporizing into the atmosphere. When the fuel evaporates in the fuel tank,
the vapor passes through vent hoses or tubes to a canister filled with
charcoal.
The canister
temporarily holds the vapor in the charcoal. The ECM will control the
system in order to draw the gathered vapor into the combustion chambers
during certain operating conditions. Engine manifold vacuum is used to
draw the vapor into intake manifold.