Electric control device to reduce the natural gas pressure allowing a regular flow of gas every time the engine requires it. It is equipped with three natural gas pressure reduction stages that allow stability at both high and low pressures. The absorption of heat. taken from parts of the regulator which are heated with the liquid of the engine cooling circuit, prevents the natural gas freezing during the fall in pressure phase. It includes an electric starting device and a mechanical safety system that trips and shuts off the main flow gas pipe if the engine is switched off or even stalls.