The most common reason for a lawnmower to start and then die immediately is because of dirty carburetor, the dirt in the carburetor fails the gasoline to combust.
Lawnmowers that stall are fairly common. Having said that, one problem is far more prevalent than the others. If your lawnmower starts and then stalls, the carburetor is most likely to blame.
The engine's carburetor is the component that draws in air and mixes it with fuel. Contrary to popular belief, gasoline is not a highly flammable substance. It only becomes extremely flammable when it comes into contact with air.
The carburetor draws in air from the surrounding environment and mixes it with the appropriate amount of fuel. If your carburetor is dirty, it is not properly mixing air, and the gas will not burn. This means that your engine will sputter slightly but will not fully engage.
Hence, a dirty carburetor can cause a lawnmower to start and then die.
To learn more about carburetor engine refer here
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