Evaporative Emissions System: Description and Operation

EVAP System Operation:

PURPOSE
The EVAP system contains and stores fuel tank HC emissions in the form of fuel vapor. When temperature and driving conditions are correct, captured vapor is directed into the air intake chamber for burning.

CONSTRUCTION
The system consists of a vacuum switching valve (VSV), a thermal vacuum valve (TVV), two check valves and a charcoal canister.

OPERATION
Refer to chart for operating conditions.