Abstract: A fuel vaporization device utilized in conjunction with an internal combustion engine which is serviced by a fluid circulating cooling system and a fuel supply system. The vaporization device comprises a compact chamber sealed by two end walls having inlet and outlet ports to allow straight-line flow of the engine cooling medium through a centrally positioned, fluid-tight heater tube. Fuel inlet and outlet ports are provided atop the chamber and a plurality of baffle members are systematically arranged along the heater tube to inhibit flow of the liquid fuel through the chamber and permit escape of fuel vapor through the outlet port. As fuel passes through the compact chamber, heat is exchanged from the cooling medium in the tube to the fuel in the chamber to cause vaporization thereof prior to carburetion or injection in an engine of a motorized vehicle. Use of the device reduces air pollution and improves fuel economy through more efficient fuel consumption.