Volkswagen Golf, GTI, Jetta 1999-2004, Jetta Wagon 2001-2004 - 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AWD, AWW, AWP
20-48
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
) located at the
highest point in the tank and through a pressure
retention valve into the evaporative emissions (EVAP)
canister.
The EVAP canister stores these vapors like a sponge.
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