Abstract: A hydrolysis system for a vehicle engine includes an electrolysis unit having a plurality of spaced, generally parallel, conductive plates and an electrolyte between the plates that produce fuel gas including hydrogen and oxygen by electrolysis; a reservoir that receives the fuel gas from the electrolysis unit and stores the fuel gas and electrolyte; an electric pump that pumps the electrolyte from the reservoir to the electrolysis unit; a pulse width modulator that provides DC power to the conductive plates and to the pump; a dryer having a filter that removes water from the fuel gas; an expansion tank having an interior cavity that expands the fuel gas and a conduit within the cavity that heats the fuel gas with circulating hot water; and a spray tube that outputs the fuel gas. Methods include preparing and using the hydrolysis system.