The invention relates to a device for the fuel treatment such as petrol or diesel for internal combustion engines. The device has a housing provided with fuel supply lines at each of its opposite ends thereof. A central opening in the tubular housing that contains a metal bar that is formed of an alloy composition including copper, zinc, tin, manganese, aluminum, and iron. And the liquid fuel circulates through the fuel line in the housing where the metal center bar displaces to the second liquid fuel line.