gas
It is normal for a carburetor to "suck air" when you are starting the engine or while the engine is running. You should stop the engine before repairing the carburetor for safety reasons.
this is the same in an older car. fuel is injected into the venturi, mixed with air, sent to the pistons, and- you are no longer working with carburetors. it is best if you research a car's carburetor.
glider
A Briggs and Stratton L head twin engine wills pit gas out of the carburetor and flood out when starting if the diaphragm has been damaged. This will cause excessive fuel to enter the carburetor.
Because your carburetor is not getting fuel to the engine - could be a plug in the fuel line or it could be dirt in the screen in the pick up tube in the carburetor. I would suggest you clean the carbutator.
Yes it has a carburetor. An engine with fuel injection would be a fuel injected engine.
Because the engine is placed on the carburetor body and the engine is warm. The carburetor should be in the metal to be melted.
781 J and K
On my 49cc scooter engine the carburetor is found on the engine. The engine is broken down into 3 parts, the part to the left (looking at it) where the air filter is is right next to the carburetor.
It has no carburetor. This engine is Fuel Injected.
No
A glider is an aircraft that doesn't have an engine.