an engine working machine that has an electronically controlled fuel injection system and a fuel tank disposed in an upper portion . the capacity of the fuel tank is effectively used and a complex structure is prevented while reducing the length of the fuel piping . an engine is disposed in a lower portion , and a fuel tank is disposed above the engine . a fuel pump is mounted on a bottom outside surface of the fuel tank , and disposed projecting on a side portion of the crankcase . an extended box is provided on a bottom surface of the fuel tank , and the fuel pump is mounted with a filter and a fuel intake port located inside the extended box . the fuel pump is housed in a pump case that is fixed to a bottom surface of the extended box .