Fuel injection pump is mainly used in automotive diesel engine. The fuel injection pump assembly is usually a whole composed of fuel injection pump, governor and other components. Among them, the governor is a component to ensure the low-speed operation of the diesel engine and the limit of the maximum speed, and to ensure that the injection quantity and the speed keep a certain relationship. The fuel injection pump is the most important part of the diesel engine, which is regarded as the "heart" part of the diesel engine. Once it goes wrong, it will make the whole diesel engine work out of order.