How is the carburetor always leaking oil?

The carburetor always leaks oil, mainly as follows: 1, the vacuum tank switch is broken, and there is oil flow in the intake pipe. When the carburetor is full, the oil filtered from the air may be poured into the cylinder, causing the car to be flooded and unable to start; 2. For the scooter, because it is a vacuum fuel tank switch, the fuel tank switch will not produce oil when the engine is not working, so the fuel tank switch is most likely to fail; 3. Carburetors can be divided into simple carburetors and compound carburetors, and carburetors can also be classified according to the types of carburetors. Among them, down-suction carburetor and flat-suction carburetor are two common types, and throttle type can be divided into rotary type and lifting type; 4. The rotating throttle changes the flow area of the air inlet by installing a disc-shaped throttle rotating around the axis between the carburetor throat and the air inlet pipe.