You will find it where the fuel line meets the engine. Also, if you cannot even find the carburetor, chances are you should not attempt any handy work by yourself.
you tube how to clean a mower carburator.
The air filter is usually located inside the canister that is bolted to the carburetor.
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If your lawn mower is pulsating, it may mean that it is not getting enough fuel and the carburetor may need cleaning.
A bad, stuck or dirty float needle inside the carburetor.
They are for the fuel solenoid shutoff
It is not fuel injected so yes it has a carburettor
Carburetor float is stuck open.
it may not have one. If it does it will be located on the fuel line between the fuel tank and the carburetor.
Directly into the carburetor throat (remove air cleaner).
Dirty or stuck open needle valve in carburetor.
There will be an inline filter on the fuel supply line from the tank to the carburetor