1999-2004 Volkswagen Golf, GTI, Jetta Evaporative Emissions System
1999-2004 Volkswagen Golf, GTI, Jetta Evaporative Emissions System. Evaporative emissions system. Function description of EVAP canister system. Depending upon the air pressure and ambient temperature, fuel vapor will form above the level of fuel in the tank. The Evaporative Emissions system prevents these HC emissions escaping to the atmosphere. In limited quantities, fuel vapors pass through a gravity valve (which closes at an angle of 45 ) loca…





