Hey everyone I'm new to rc.
​​​​​​I have a Toyan L200ac engine that run on gasoline
I Have a problem.
I get fuel to the engine and it's starting for few seconds when cover the carb air intake with my thumb, only then I see the fuel coming to the engine.
Help please.

Looks like there's a fuel pump on the carburetor. Thats where I would look first. Plus look for air leaks in fuel supply lines and carburetor connection to engine.