Disclosed herein is an emission control device for use with a carburetor or fuel injection engine. The device is comprised of a body member of predetermined thickness and may define therein at least one through opening. The through opening communicates with the fuel opening in the carburetor or the fuel injection body. The device also has an air passageway largely defined in its surface. The air passageway communicates with the through opening and lies generally under the fuel passageways of the carburetor or injection body so that air passed through the passageway passes into the through opening and under the fuel passageways.