copied from the net: Activated carbon canisters effectively reduce hydrocarbon emissions and hence curtail the release of pollutants. Fuel vapors escaping from the tank are stored in the filter and burnt during engine operation. Owing to the strict U.S. limits, activated carbon canisters have been developed for this market, which adsorb both vaporization and refueling losses, and which come with a leakage diagnosis. A differentiation is made between LEV2 and the even more stringent PZEV legislation. In countries outside the United States, RoW (Rest of World) activated carbon canisters are used. The Korean market uses a hybrid form with RoW activated carbon canisters and leakage diagnosis. Accordingly, activated carbon filter modules can be categorized as follows:

RoW activated carbon canisters
Korea: RoW activated carbon canisters with leakage diagnosis
USA: LEV2 and PZEV activated carbon canisters with leakage diagnosis
Lower emission values call for the development of efficient adsorption materials as well as the reduction of external interfaces and result in complex modules manufactured with new production processes. Optionally, these modules can be turned into a system equipped with dust filter and a water separation feature. As one of the leading activated carbon canisters manufacturers worldwide, MAHLE offers optimized solutions for every market.

http://www.mahle.com/C125705E004FDAF9/CurrentBaseLink/W276LG9N631WEBBEN

E32 750iL 11/88, E32 750iL Highline 03/90
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