FUEL INJECTOR

A nozzle body (16) of a fuel injector (10) has an inner space extending along a main axis (A) and adapted to receive a slidably arranged valve needle (14), the inner space being divided in an upstream cylindrical chamber (38) and, a downstream cylindrical chamber (40). The nozzle body (16) is further provided with an inter-chambers (42) portion having a cylindrical tubular wall (44) axially protruding in the upstream chamber (38) and being adapted to cooperate, in use, with the valve needle (14) to define a throttle (28) inducing a fuel pressure drop.