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1. An apparatus for controlling a single fuel tank, the apparatus comprising: the single fuel tank having a plurality of volume parts; and a controller configured to control a charging condition of a fuel charged in the single fuel tank and to selectively control use of the fuel charged in the plurality of volume parts based on an amount of the fuel used or a state of the single fuel tank, wherein the single fuel tank includes: a chamber including a first volume part on one side and a second volume part on the other side with respect to a partition wall, opposing sides of the partition wall being in direct contact with the fuel; a first valve provided on the one side of the chamber and configured to adjust opening or closing of the first volume part; a second valve provided on the other side of the chamber and configured to adjust opening or closing of the second volume part; and a third valve provided in the partition wall and configured to adjust opening or closing for communication between the first volume part and the second volume part, and the controller controls the first valve to be opened and the second valve to be closed or controls the first valve to be closed and the second valve to be opened in a state in which the third valve is opened to charge the fuel in the single fuel tank, and the controller controls one of the first valve and the second valve to be opened, another of the first valve and the second valve to be closed, and the third valve to be opened, in response to an input to increase fuel output.
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