Transportable fuel tank

The tank has a lockable filling/pouring aperture arranged at an end (21) of the tank and designed as a banana-shaped small container (20) in a form of a curved part-annular tube. The lockable filling/pouring aperture is provided with a screw-type cap (24). The small container is formed and positively matched to a portion of a motor car, and possesses a specific form adapted to a trough-shaped portion of the motor car. An end of the small container is formed with a charging hole (26), and a pouring aperture (27) is provided at another end (23) of the tank.