A fuel injector for a turbomachine, the injector comprising from upstream to downstream a sealing valve , a diaphragm and a metering device , the fuel injector comprising from upstream to downstream an inlet body , a central body into which the inlet body opens, a fixing plate for fixing the injector to a combustion chamber wall, an injection unit and an injector nose , the injector being delimited to the exterior of the injector by a casing , the inlet body accommodating the sealing valve inside the casing , the valve comprising a stopper , a spring and an inlet nozzle , the spring biasing the stopper in a closed position, the inlet nozzle being configured to act as a seat for the stopper , the stopper comprising a body , an inner pipe inside the body and admission pipes which open into the inner pipe through the body , the body of the stopper comprising an annular wall , a base wall and an annular contact edge , the base wall closing the stopper upstream and the contact edge being designed to come into contact with a gasket in a closed position of the stopper , each admission pipe being a channel extending between an intermediate space and the inner pipe , the admission pipes being angularly distributed through the body of the stopper and being inclined downstream relative to the longitudinal direction of the inlet body , the intermediate space being radially delimited to the exterior by an internal surface of the casing and being radially delimited to the inside by the stopper in a closed position of the stopper , the intermediate space connecting the inlet nozzle to the stopper in an open position of the stopper and being devoid of any fluid communication with the inlet nozzle in a closed position of the stopper , the inlet nozzle comprising an annular body which is traversed at its two opposite ends along the longitudinal direction of the inlet body by an inlet and an outlet , the inlet nozzle being traversed by a central pipe which extends from its inlet to its outlet , the inlet opening to the exterior of the injector , the annular body comprising an annular rim surrounding the central pipe and comprising a housing for a gasket , the housing being delimited by a base wall , an opening opposite to the base wall , and two opposite walls which each extend between the base wall and the opening , the gasket being in contact with the stopper in a closed position of the stopper by preventing the fuel from flowing between the outlet of the inlet nozzle and the inner pipe , characterised in that the gasket is crimped into the housing by the walls which are inclined towards one another in the direction of the opening , the walls are spaced apart by a distance (d) which is equal to at most 70% of the maximum diameter (D) of the gasket along a radial direction in the longitudinal cross-section of the inlet body , to close the housing , the annular rim comprising an evacuation pipe opening into the housing and to the exterior of the inlet nozzle , the evacuation pipe being configured to evacuate fluid out of the housing , at least one part of the evacuation pipe extending along a direction (Z 2 -Z 2 ) which is substantially parallel to the longitudinal direction (X-X) of the injector body , and being formed by a groove provided on a radially external surface of the inlet nozzle facing the internal surface of the casing . <EOS>