Evaporative Emissions System: Description

The Fuel Evaporation control system prevents the escape of raw fuel vapors to atmosphere. System consists of a sealed fuel filler cap, special fuel tank with integral vapor separator (external liquid/vapor separator on GLC Station Wagon), check valve (except Federal B2000), purge control valve (except Federal B2000), water thermo valve (except Federal B2000), charcoal canister and connecting lines and hoses. A vacuum controlled evaporative shutter valve is installed on Calif. GLC (Auto. Trans.) and 626 models to control carburetor vapors.

Fig 1: Schematic Of Typical Mazda Piston Engine Fuel Evaporation Control System

Courtesy of MAZDA MOTORS CORP.