Fuel supply device for a internal combustion engine

The present invention relates to a fuel supply device for a internal combustion engine, which is provided with a low pressure area and a pumping installation, wherein a pressure storage system with a memory cell under high pressure is et between the pumping installation and a injector; the pressure storage system connects with the pumping installation through a high pressure fuel conduit under high pressure, and connects with the injector through the high pressure fuel conduit with a switch that under high pressure according to injection cycle occasionally; and the switch transports fuel to the injector according to injection cycle. According to the present invention, a overflow device and the injector plays synergistic action to make sure that over brim fuel in the fuel conduit that leading to the injector can be import to a spillway chamber that can be switched by the overflow device while the switch is opened, and bypass fuel can be delivered to the overflow device through a bypass conduit that separated f