Anti-overpressure fuel tank

A fuel tank comprising a venting system comprising a flap for closing an opening made in the tank, said flap being subjected to a float and is mounted in a hinged manner in the tank so as to adopt a closed position, by being pushed by the float when the level of fuel in the tank reaches a certain threshold, and an open venting position, by being driven by the float when the level of fuel is below said threshold, characterized in that the flap comprises a valve in the form of a rod mounted sliding within an orifice of the flap, between an open position and closed position of the orifice, said rod comprising a first end with a shoulder intended to act as a stop for the closed position of the rod, and a second end with a shoulder forming a seat for a compression spring arranged around the rod and pressed against the flap in order to maintain the rod in the closed position, so that when the force exerted by the internal pressure on the valve exceeds the sum of the forces exerted on the valve by the atmospheric pressure and by the spring, said valve is pushed into the open position, against said spring, and ensures venting of the fuel tank in order to prevent overpressure within said tank.