Abstract: A heating unit preheats and stabilizes No. 2 fuel oil delivered through a conduit to the nozzle of an oil burner for optimizing efficiency of combustion. The heating unit is generally formed around a section of oil conduit or other elongate tubular metal core (18) at least equal to the inside diameter of the oil delivery conduit in which it is to be incorporated. At least one coat or layer (20) of heat conducting electrically insulating porcelain-like cement is formed on the core. A helical heating element or coil (21) of high temperature alloy wire surrounds the layer (20) and core (18). The outside of the coil is covered by an electrical and thermal insulating second layer (22) of refractory-type cement of lower thermal conductivity than the porcelain-like cement. The entire unit may be housed in an elongate box (16) packed with high temperature insulation (27) and with high temperature double insulated lead wires (24, 25, 26) extending into the box from the secondary of a 12-14 volt, 4-7 amp transformer.

Abstract: A new and improved fuel vaporization and delivery system for vaporization of gasoline from the fuel line of an internal combustion engine and for delivery of fuel in the vapor state to a conventional carburetor or into an air stream at the intake manifold to afford increased exposure of the fuel in the fuel air mixture for complete combustion and utilization of fuel. The invention incorporates self regulatory features, stages and materials to match the chemical and thermodynamic properties of gasoline while maintaining a safe margin below the flash point of gasoline.