Editing Vehicle emissions control (section)

==Evaporative emissions control==
{{Redirect-acronym|EVAP|[[Evaporation]]}}{{See also|Onboard refueling vapor recovery}}[[File:Aktivkohlefilter 205.JPG|thumb|Fuel vapor storage canister for a [[Peugeot 205]]]]
Evaporative emissions are the result of gasoline vapors escaping from the vehicle's fuel system. Since 1971, all U.S. vehicles have had fully sealed fuel systems that do not vent directly to the atmosphere; mandates for systems of this type appeared contemporaneously in other jurisdictions. In a typical system, vapors from the fuel tank and carburetor bowl vent (on carbureted vehicles) are ducted to canisters containing [[activated carbon]]. The vapors are [[adsorbed]] within the canister, and during certain engine operational modes fresh air is drawn through the canister, pulling the vapor into the engine, where it burns.