Evaporative Emission Control Canister: Description and Operation

Evaporative Emissions Canister:

PURPOSE
Vapor storage component of EVAP system.

OPERATION
Canister is connected to the fuel tank by a vapor hose with an in-line metering type vapor valve and separator (3-door model only). Another vacuum/vapor hose, with in-line purge control solenoid, connects canister to intake manifold. The canister stores fuel vapors when the engine is "OFF" and when vapors are not being routed directly to the induction system. During purge conditions, fresh air is drawn through a vent on the bottom side of the canister, allowing stored vapors to pass through the vapor return line to the induction system.

CONSTRUCTION
Canister is a plastic cylinder filled with activated charcoal granules. Charcoal granules are used as a vapor trap because of their great surface area and ability to hold up to one-third of their weight in fuel vapors.