NOVELTY - The hydrogen fuel combustion system includes electrode plate assembly (5) having predetermined voltage applied across cathode and anode plates to dissociate water into constituent hydrogen and oxygen gases which are collected in upper part of the vessel (3) and inducted from the output pipe of the vessel to the air intake for hydrocarbon combustion. An air injector (9) is arranged in the water return line (7b), and injects air into the vessel to cause bubbling of water supplied between and around the electrode plate assembly. Only water is used as the electrolyte fluid without any additives.    USE - Hydrogen fuel combustion system for internal combustion engine for vehicle.    ADVANTAGE - Water circulation pump in the water containment vessel is operated to maintain circulating water flow between and around the electrode plate assembly in the electrolyzer vessel. Air bubbling in the water flow to the electrolyzer vessel is believed to increase the surface area of water molecules relative to the voltage and current density across the cathode and anode plates, which increases the rate of dissociation of hydrogen and oxygen gases without the need for high electrode voltages or current densities. Air bubbling of water in the electrode stack in effect atomizes the water for easy dissociation of hydrogen gas using electrical power as low as about 96 watts for single stack of electrode plates. Electromagnetic coil assembly keeps hydrogen and oxygen gases from recombining in transit and avoids the need for separating the oxygen gas from the hydrogen gas, for cooling the gases in transit, and/or for applying flash arrester regulator in the system. Increases fuel efficiency and reduces exhaust gas pollutants since hydrocarbon fuel usage is made lean and is burned completely and cleanly. Cathode plate assembly is optimized with the use of 50/50 by volume titanium/germanium alloy, which has a high resistance against corrosion by hydrogen.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view illustrating the system for electrolyzed hydrogen gas enhancement of hydrocarbon fuel combustion.    Vessel (3)    Electrode plate assembly (5)    Water circulation line (7a)    Water return line (7b)    Air injector (9)