Evaporative Emissions System: Description and Operation

Evaporative Emissions - VIN Range: G45704->G99999







The evaporative emission fuel vapor management system consists of an evaporative emission canister and an evaporative emission canister purge valve. A combination of plastic pipes and rubber hoses connect the evaporative emission canister to the fuel tank and the evaporative emission canister purge valve to the intake manifold.







Onboard refuel vapor recovery (ORVR).
The vehicle is fitted with an onboard refuel vapor recovery (ORVR) type fuel tank. During refuelling all vapor is collected in the evaporative emission canister as well as in normal vehicle operations.

When the evaporative emission canister purge valve is closed, the fuel tank is vented into the evaporative emission canister through the fuel tank roll-over valve. The evaporative emission canister absorbs the fuel vapor and prevents the release of hydrocarbons into the atmosphere. When the vapor evaporative emission canister purge valve is opened, the canister is exposed to the intake manifold vacuum and the fuel vapor deposits are drawn into the manifold where they mix with the incoming air/fuel charge.

The evaporative emission fuel vapor management system is controlled by the engine control module (ECM) according to calibrated data tables.