a liquid fuel vaporizing carburetor for an internal combustion engine including a housing having a fuel reservoir , a filter assembly including a plurality of filters of progressively smaller pores positioned in said housing ; one of said filters being immersed in the fuel reservoir , a baffle for drifting incoming air into the filter in the reservoir and secondary air into openings in the housing to add secondary air to the air - fuel mixture as the air - fuel mixture passes through the filter assemblies .