Hydrocarbon absorbing air filter system

Abstract

A system and methods are provided for a hydrocarbon absorbing air filter system to arrests evaporative hydrocarbon emissions from an intake duct of an internal combustion engine. The system comprises an air filter box that includes an air inlet to an air filter disposed inside the air filter box. A hydrocarbon trap outside the air filter box and in fluid communication with the air filter absorbs evaporative hydrocarbon emissions leaking from the air intake duct when the engine is not operating. The hydrocarbon trap includes an outer housing that couples with an inner housing and a hydrocarbon absorbing pad within an interior between the outer and inner housings. Ports in the inner housing allow hydrocarbon emissions to be arrested by the hydrocarbon absorbing pad. A conduit extends from the hydrocarbon trap to the air intake duct of the internal combustion engine.

Dependencies are inferred from the claim text.