An apparatus (20) may comprise a fuel tank (10), a cover (22), a fuel discharging unit (30), a control unit (26), and a heat sink (28). The cover (22) closes an opening (12) in an upper portion of the fuel tank (10). The fuel discharging unit (30) is disposed within the fuel tank (10), and the fuel discharging unit (30) draws fuel into the fuel tank and discharges the drawn fuel outside the fuel tank. A biasing member (25) may be disposed between the fuel discharging unit (30) and the cover (22), and bias the fuel discharging unit (30) toward the bottom surface of the fuel tank (10). The control unit (26) controls the fuel discharging unit (30). The heat sink (28) is thermally connected to the control unit (26), and dissipates heat from the control unit (26). The heat sink (28) may include an extended portion (28b) extending in an up-down direction in the fuel tank (10). The fuel discharging unit (30) may be slidably supported by the extended portion (28b).