Patent ID: 6640770
Filing Date: 2003-11-04
Classification: F02M

Abstract:
An emission control apparatus for a combustion engine having a carburetor, the emission control apparatus comprising:a carburetor body having a valve seat; a fuel bowl carried by the carburetor body, the fuel bowl defining a fuel chamber; a fuel-in passage defined by the carburetor body, the fuel-in passage extending between an external carburetor fuel inlet and an inlet aperture defined by the valve seat; a fuel-out passage defined by the carburetor body, the fuel-out passage communicating with the fuel chamber; a float valve disposed within the fuel chamber, the float valve constructed and arranged to close the fuel-out passage when the fuel chamber contains sufficient fuel and to open the fuel-out passage when the fuel chamber contains insufficient fuel; a recess defined by the valve seat, the inlet aperture and the outlet aperture each communicating with the recess; and a valve head disposed in the recess, the head having an on position and an off position, wherein the inlet aperture is in communication with the outlet aperture via the recess when the head is in the on position, and wherein the inlet aperture is obstructed by the head from being in communication with the outlet aperture when the head is in the off position.