NOVELTY - The device for evaporating liquid fuel for a reformer (3) of a fuel cell system for generating electric current from anode gas containing hydrogen, and cathode gas containing oxygen useful in motor vehicle, comprises a porous evaporator structure for the evaporation of liquid fuel brought into the structure, a supply pipeline (38) connected to a fuel tank (39) with the structure for supplying fuel into the evaporator structure, a conveyor (19) arranged in the supply pipeline for driving the fuel, and a dosing valve (40) arranged in the supply pipeline.    USE - The device for evaporating liquid fuel for a reformer of a fuel cell system for generating electric current from anode gas containing hydrogen, and cathode gas containing oxygen useful in motor vehicle (claimed).    ADVANTAGE - The device is reliable and ensures improved evaporation of the liquid fuel without bubbles and uniform mixture formation in the liquid fuel.    DETAILED DESCRIPTION - The device for evaporating liquid fuel for a reformer (3) of a fuel cell system for generating electric current from anode gas containing hydrogen, and cathode gas containing oxygen useful in motor vehicle, comprises a porous evaporator structure for the evaporation of liquid fuel brought into the structure, a supply pipeline (38) connected to a fuel tank (39) with the structure for supplying fuel into the evaporator structure, a conveyor (19) arranged in the supply pipeline for driving the fuel, a dosing valve (40) arranged in the supply pipeline downstream to the conveyor for adjusting a liquid fuel flow through the supply pipeline from the dosing valve for the evaporator structure, a return pipeline that is connected at the supply pipeline between the conveyor and the dosing valve at the entrance side and at the fuel tank at the exit side, and bubble precipitators arranged in the supply pipeline upstream to the conveyor for removing of bubbles from the liquid fuel in the supply pipeline. A pressure maintaining valve is arranged in the return pipeline for adjusting a predetermined or predeterminable pressure. Two bubble precipitators are arranged in the supply line in row, and/or the respective bubble precipitator is connected over a return line with the fuel tank, and/or a joint return line is arranged for two or more bubble precipitators. A non-return check valve blocking back to the conveyor is arranged in the supply pipeline between the conveyor and a connection position of the return pipeline. The conveyor is formed through a gear pump. The evaporator structure is a porous structure for fuel distribution and surface enlargement and is formed by fleece material, metal foam, ceramic foam, non-woven or a mat. The supply pipeline ends directly on or in the evaporator structure. A vibration damper is arranged in the supply pipeline and/or in the return pipeline. INDEPENDENT CLAIMS are included for:    (1) a reformer for generating hydrogen containing reformat gases from liquid fuel and an oxidator; and    (2) fuel cell system for generating electric current from anode gas containing hydrogen, and cathode gas containing oxygen.    DESCRIPTION OF DRAWING(S) - The figure shows an evaporator device.    Reformer (3)    Conveyor (19)    Supply pipeline (38)    Fuel tank (39)    Dosing valve. (40)