A gas fuel admission system for a gas fired engine

The present disclosure refers to a gas fuel admission system (1) for a gas fired engine (5). A gas pressure regulating unit (15) includes a gas pressure regulating unit inlet (20) and a gas pressure regulating unit outlet (25). The gas pressure regulating unit (15) is configured to receive gas having a supply pressure at the gas pressure regulating inlet (20) and to discharge the gas at an injection pressure at the gas pressure regulating unit outlet (25). An engine gas inlet (6) is configured to direct gas into the at least one combustion chamber (10). A gas admission valve (40) has a valve inlet (45) and a valve outlet (50), the valve inlet (45) being fluidly connected to the gas pressure regulating unit outlet (25) via a gas supply conduit (35) and the valve outlet (50) being fluidly connected to the engine gas inlet (6). The gas admission valve (40) is configured to admit the gas having an injection pressure at a predetermined time for a predetermined duration into the engine gas inlet. A gas pressure relief device (60) is fluidly connected to the gas conduit (35) and it is configured to relieve overpressure of the gas in the gas supply conduit (35), if a pressure differential between the injection gas pressure and the intake air pressure is above a predetermined threshold. The disclosure also refers to a method for avoiding engine shutdowns of a gas fired engine (1) as a consequence of load rejection events, and to a power generation unit (100) as well as to a gas pressure relief device (60).