would you be referring to the the black rubber piece that sits underneath the primer bulb that has a hole in the top, and slit in the bottom? I guess that would be a check valve in and of itself - one way valve. Or would you be referring to another check valve deeper, less accessible within the carburetor ?
I'm just thinking about it now. I guess that's the only check valve in that carb, if it was clogged or stuck open, it would definitely give me problems... I guess what my problem is now, is now that I am getting fuel, Now I need to configure the settings,
... Unless - if there is somewhere I might've not cleaned well enough that is giving me a bad flow problem, hence my problem with bogging down and dying.
Perhaps I need to clean the air filter - it may be dirtier than I think. Lacking air would make it bog down.