NOVELTY - Apparatus (18) for converting a fuel into reformulated fuel comprises fractionator (22) which fractionates the fuel into light and heavy fractionates, steam reformer (30) for reforming the light fractionate into reformate in first flow along first path, where the reformate is useful as fuel for the fuel cell/other energy-producing system, burner (32) which burns a portion of the heavy fractionate combined with air from air stream in second flow along second path to form heat, where both paths are separated to prevent mixing of the flows, and units for adding the heat to the reformer.    USE - As apparatus for converting a fuel into reformulated fuel which is useful in a fuel cell or other energy-producing systems (claimed) such as internal combustion engines, auxiliary power units, furnaces, heaters, boilers and fuel upgrading reactors.    ADVANTAGE - The apparatus demonstrates the effectiveness of the fuel preprocessor in reducing the size and the cost of the fuel desulfurization step; and reliably converts distillate fuels to syngas.    DETAILED DESCRIPTION - Apparatus (18) for converting a fuel into reformulated fuel for use in a fuel cell or other energy-producing systems, comprises fractionator (22) which fractionates the fuel into light and heavy fractionates, steam reformer (30) for reforming the light fractionate into reformate in first flow along first path, where the reformate is useful as fuel for the fuel cell or other energy-producing system, burner (32) which burns a portion of the heavy fractionate combined with air from an air stream in second flow along second path to produce heat, where both paths are separated sufficient to prevent mixing of the flows, and units for adding the heat to the reformer. The apparatus further comprises a vaporizer for vaporizing the portion of heavy fractionate, where the vaporizer contains a wick which is comprised of a ceramic material having a surface, and the surface is formed with several channels.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective view of the apparatus.    Apparatus (18)    Fuel preprocessor (20)    Fuel fractionator (22)    Optional desulfurizer (24)    Mixing chamber (26)    Prereformer (28)    Reformer (30)    Burner (32)