Abstract: A gas generating apparatus for use with an internal combustion engine, the apparatus comprising a reactor including a housing, at least one anode and at least one cathode located within the housing, an electrolyte input and a gas output, wherein the at least one anode and the at least one cathode are electrically connected to an electrical energy source; the electrolyte input is adapted to provide in use a flow of electrolyte such that a substantially constant volume of electrolyte is maintained within the reactor; and the gas output is in fluid communication with an air inlet of the engine, whereby in use the electrolyte is broken down to a gas in the reactor and the product gas is supplied to the engine.