Low evaporative emissions integrated air fuel module

This invention relates to control of engine evaporative emissions of hydrocarbons and to a low emission integrated air fuel module capable of containing such emissions. An integrated air fuel module () for an internal combustion engine reduces or eliminates the escape of hydrocarbon evaporative emissions from the integrated air fuel module () system, sub systems and components. The integrated air fuel module () includes containment means (), such as a valve () or carbon adsorber, that blocks the escape of evaporated hydrocarbon emissions from the air inlet () of an engine during engine off conditions. The module () provides a reduced number of potential external hydrocarbon leak and permeation paths to the surrounding atmosphere. Preferred geometries of the intake manifold () in the module () with the internal integration of other normally external systems, such as fuel injection () and positive crankcase ventilation () systems, accomplish the containment of evaporative emissions within or entering the air fuel module () between engine operating periods when the engine is shut down.