Fuel pump assembly

A fuel pump assembly having a fuel pool formed on an inner surface of a lower case, a fuel passage for guiding fuel stored in the fuel pool to an engine, a pressure maintained in the lower case, and adjusting a pressure of fuel flowing through the fuel passage A regulator, and an upper casing that covers the lower casing, the fuel pump assembly includes: a mounting portion provided in the lower casing and in the fuel pool; and a pressing portion extending from the upper casing provided in the upper casing, the pressing portion corresponds to The mounting portion, wherein the pressure regulator is sandwiched between the mounting portion and the pressing portion. The fuel pump assembly has a small number of parts, is not easily affected by vehicle vibration, and is easy to assemble.