1. The answer depends on the manufacturer. Who made the engine?
2. Get the model and other info from the engine. Then go to the manufacturer's web site to download a copy of the manual and parts diagram.
3. Start from the outside of the mower. Remove the largest outer parts first until you can see the carburetor with nothing on top of it.
Directly into the carburetor throat (remove air cleaner).
Take a clean rag and stuff it into the tank - it will soak up the water.
you tube how to clean a mower carburator.
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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
You will need to remove and clean the gas tank and the carburetor. Then replace the gas lines and filter.
Carburetor float is stuck open.
It is not fuel injected so yes it has a carburettor
No, it is not necessary to remove it. You can charge it right there on the mower.
There will be an inline filter on the fuel supply line from the tank to the carburetor