Fuel injection device for an internal combustion engine, in particular for a hydrogen combustion engine

Fuel injection device for an internal combustion engine, comprising

• a central rail (10) in fluid communication with a primary fuel tank,
• an additional fuel pressure accumulator (20), the internal volume of which is directly connected to the central rail (10) only along correspondingly-aligned openings in walls of the central rail (10) and accumulator (20) via a control valve (13) integrated into the central rail (10) or accumulator (20), to temporarily provide a simultaneous fuel supply to the central rail (10) from the additional fuel pressure accumulator (20) and the primary fuel tank,
• a pressure sensor integrally-arranged within the central rail (10) and spaced apart from the connection of the central rail (10) with the auxiliary fuel pressure accumulator (20), to protect the pressure sensor from a pressure wave when the connection between the central rail (10) and the auxiliary fuel pressure accumulator (20) is open,
• a pressure sensor arranged inside the auxiliary fuel pressure accumulator (20), and
• a control system coupled to both said sensors and configured to keep the control valve (13) closed during normal operation of the internal combustion engine and alternately open and close the control valve (13) upon increase in fuel quantity above a threshold value.