Abstract: The invention relates to a fluid treating device for treatment of gasoline or diesel fuel for land and/or water vehicles. The liquid fuel treating device has an elongated housing provided with liquid fuel lines on opposite ends thereof. A central opening in the housing houses a metal bar which is formed with an alloy, the metal composition including copper, nickel, zinc, tin, magnesium and silicon. The liquid fuel is forced through the liquid fuel line into the housing, wherein it contracts the metal bar and exits through a second liquid fuel line as a treated liquid fuel with improved characteristics, substantially free of pollutants.