A device submersed into the fuel tank of motor vehicles with liquid-hydrocarbon internal-combustion engines for reducing polluting emissions and saving energy, characterized in that there are generated, in combination, magnetic fields and far infrared electromagnetic waves which spread inside the fuel and interact with the molecules of the hydrocarbons and temporarily modify their structure so that they can be easily vaporized. This temporary modification of the hydrocarbons' molecular structure is obtained by energising said molecules through the energy associated to said far infrared rays under the action of said magnetic fields.
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