Circulating fuel heating system for internal combustion engines

A circulating fuel heating system for internal combustion engines having a carburetor, said system comprising

• heat exchanger means for raising the temperature of the fuel to beyond its vaporization temperature, pump means for delivering fuel to said heat exchanger means, a fluid heat source carried by the engine and operably connected to the heat exchanger means, a fluid heat flow control valve operably connected to the heat exchanger for selectively controlling the flow of heated fluid from the fluid heat source through the heat exchanger means, a fuel controller means operably connected between the heat exchanger means and the carburetor, return control means operably connected between the controller means and the pump means for the routing of unused fuel back to said pump means, a first temperature sensor carried by the controller means and operably connected to the fluid heat flow control valve for regulating the flow of fluid from the fluid heat source through the heat exchanger means to maintain the temperature of the fuel in the controller within a predetermined range above its temperature of vaporization.