Fuel pump assembly is an important part of electronic gasoline injection system of automobile engine. Its basic function is to provide fuel with a certain pressure to the engine fuel injection system. The quality and working condition of the electric fuel pump will directly affect the working condition of the fuel injection system of the whole vehicle. At the same time, it will also greatly affect the fuel injection quality and the power performance and fuel economy performance of the whole vehicle, which has a great impact on the performance of the whole vehicle.