Combined pressure surge fuel pump and nozzle assembly

摘要

A fuel pump 811 comprises a housing including therein a high pressure fuel chamber 115, a fuel outlet valve 271 communicating with the high pressure fuel chamber 115 and being operable to prevent fuel inflow and to permit fuel outflow when the fuel pressure is above a predetermined level, a fuel inlet valve 261 communicating with the high pressure chamber 115 and being operable to prevent fuel outflow and to permit fuel inflow, and a bearing bore 815 extending from the high pressure chamber 115. A rod 817 is slidably and sealingly supported in the bearing bore 815 for movement relative to a retracted position, and structure is located in the housing for displacing the rod 817 from the retracted position and in the direction toward the high pressure fuel chamber 115 through an initial stroke length without encountering substantial resistance and thereafter displacing the rod 817 through a subsequent stroke length which is effective to highly pressurize the fuel in the high pressure fuel chamber 115. <IMAGE>