The function of gasoline engine fuel supply system is to prepare a certain amount and concentration of combustible mixture according to the working needs of the engine and send it to the cylinder. There are two types of fuel supply systems: carburetor type and electronically controlled fuel injection type. The carburetor oil supply system generally consists of a gasoline tank, a gasoline pump, a gasoline filter, a carburetor, an air filter, an air intake and exhaust device, etc. (This system has been eliminated); The fuel supply system of electronic fuel injection consists of air supply system, fuel supply system and electronic control system.