(57) Abstract: The present invention relates to a fuel injection system for an internal combustion engine having a fuel injector, harm the fuel injector, the inlet port (2); overflow port (3); working chamber (10) and nozzle pressure amplifier composed of the piston (6) forming a plunger (7) adapted for injecting fuel through the (14) (14); control chamber (5) and the poppet chamber (27) a hydraulic valve (4) comprising an inlet port (2) having a poppet (25) disposed between the working chamber (10), open to the working chamber (10), wherein said poppet (25) provides the aperture slot (28), a hydraulic valve; means (31) for deflecting toward the hydraulic valve (4) in its closed position; the control chamber (5) and the overflow port ( comprising a bypass channel (29), for connection of the control to the chamber (5) of the poppet chamber (27); the installed control valve (21) between the 3).