Fuel supply system

The system has conveyors (5, 5`) arranged at a fuel container (1) for conveying fuel, and a connecting piece (11) for guiding of the fuel to an outlet. The piece has a mixing valve that closes an inlet with small force when there is a pressure difference between the inlets. Each inlet has a valve seat, and a valve body is guided between the valve seats. A control valve is arranged between the mixing valve and the outlet.