Abstract: A flow homogenizer for an internal combustion engine which can be used as a carburetor or as a booster for a carburetor. The homogenizing unit includes a hollow housing open at both sides. One tube extends through the wall of the housing and is adapted to be connected to a fuel source. A second tube is concentrically mounted on the first tube in tight fitting relationship while being able to rotate about the first tube. The first tube contains at least one slot and the second tube a plurality of holes in a predetermined arrangement and positioned so that as the second tube rotates relative to the first tube the number of holes exposed to each slot is changed thereby controlling the size of opening for fuel to flow through the holes into the housing. A damping member is mounted on the second tube in the housing to rotate therewith. The damping member has a recess in a surface portion thereof to expose the openings in the second tube and to open the passageway through the housing from end to end.