TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The fuel tank comprises a fuel tank body and a porous medium through which the liquid fuel is absorbed and transferred. It is capable of being attached to and detached from the cavity plate. The cavity plate comprises a fuel supply port formed at one edge of the cavity plate, through which the liquid fuel supplied from the fuel tank is transferred; micro-channels connected to the fuel supply port, through which the liquid fuel from the fuel supply port is transferred; and at least one cavity connected to the micro-channels to store the fuel transferred through the micro-channels. The cavity and the micro-channels respectively have bottoms that are closed and tops that are open. The porous medium is bonded to an inside of the fuel supply port. Two or more of the cavities are provided to be parallel to the fuel supply port. The micro-channels are further provided as a fuel passage between the cavities. The cavity plate also includes at least one cavity, and has an inner pressure of a negative pressure. The thin film type active pump is attached at a position corresponding to the cavity. It moves in a lateral direction or longitudinal direction. The cavity plate moves in at least one of the longitudinal direction with respect to the lateral directional movement of the thin film type active pump, and moves in the longitudinal direction according to the longitudinal directional movement of the thin film type active pump. The nozzle plate comprises current collector part(s) coated at a predetermined region; nozzles to eject the fuel upward; and channels to discharge carbon dioxide and vapor transferred from above, in which the nozzles and the channels are formed on the current collector part. The nozzles are formed at a position corresponding to the cavity. The channels have one end opened at a side of the nozzle plate to discharge carbon dioxide and vapor and the other end closed. They are parallel to each other and have an end opened, in which the opened ends in the adjacent channels are opposite to each other. The nozzles are arranged in row(s). The channels are formed parallel to the row(s) of nozzles. Three groups of successive rows of the nozzles are formed. The channels are formed between the groups of the successive rows of the nozzles, in which the opened ends of adjacent channels are opposite to each other. The current collector part is formed by coating a metal, preferably gold or gold alloy, on the nozzle plate. The fuel supply device further comprises a supplementary plate between the cavity plate and the nozzle plate, in which the supplementary plate has open parts at positions corresponding to the cavity; and a nozzle supplementary plate having openings at positions corresponding to the nozzles on the nozzle plate.