Degassing device for a pumping assembly of a fuel distribution device, said pumping assembly comprising a pump to circulate the fuel coming from a storage tank, said degassing device comprising: - a degassing container fed by a liquid/ gas fuel mixture exiting the pump, the degassing container comprising a lateral pipe configured to evacuate the degassed liquid fuel to a distribution nozzle and an axial pipe configured to evacuate a fraction of the gas-enriched fuel to a separation tank in which the gas-enriched fraction is separated before being evacuated to the pump input, - control means connected to the axial pipe of the degassing container to make it possible to vary the flow of the gas-enriched fraction sampled by said axial pipe as a function of its gas content, the control means comprising a control chamber equipped with an axial opening through which the axial pipe opens, an output connected to the separation tank and a piston equipped with a diaphragm in fluid communication with the axial opening, said piston being able to move to the interior of the control chamber following an X axis direction between an open position of the output when the amount of gas in the fraction of gas-enriched fuel in the axial pipe is high and a partially closed position of the output when the amount of gas in the fraction of gas-enriched fuel in the axial pipe is low, said piston being subject to the action of a counter spring which tends to return it to the open position, characterized in that the control means comprise guiding means making it possible to guide the piston in movement following the axis direction between the open and partially closed positions of the output, said guiding means being upstream of the axial opening of the control chamber. - a degassing container fed by a liquid/ gas fuel mixture exiting the pump, the degassing container comprising a lateral pipe configured to evacuate the degassed liquid fuel to a distribution nozzle and an axial pipe configured to evacuate a fraction of the gas-enriched fuel to a separation tank in which the gas-enriched fraction is separated before being evacuated to the pump input, - control means connected to the axial pipe of the degassing container to make it possible to vary the flow of the gas-enriched fraction sampled by said axial pipe as a function of its gas content, the control means comprising a control chamber equipped with an axial opening through which the axial pipe opens, an output connected to the separation tank and a piston equipped with a diaphragm in fluid communication with the axial opening, said piston being able to move to the interior of the control chamber following an X axis direction between an open position of the output when the amount of gas in the fraction of gas-enriched fuel in the axial pipe is high and a partially closed position of the output when the amount of gas in the fraction of gas-enriched fuel in the axial pipe is low, an open position of the output when the amount of gas in the fraction of gas-enriched fuel in the axial pipe is high and a partially closed position of the output when the amount of gas in the fraction of gas-enriched fuel in the axial pipe is low,