Evaporative Emissions System: Description

Porsche Fuel Evaporation Emission Control System is designed to prevent fuel vapors from being emitted into the atmosphere.

The system consists of a non-vented fuel tank filler cap, an expansion chamber, an activated charcoal canister, a purge valve, a vent valve, and a series of vent lines which interconnect the components between the fuel tank and air cleaner.

On air-cooled models, a pressure line, used to purge the system, is connected between the engine blower assembly and the charcoal canister.