Difficult cold start

Trust me, I have tried all possible methods.
If I use method you (and manual) suhgest, it will not start ever.

Also, revving is only way to keep it running (or it revs because gas pedal is pressed to the bottom). I am aware that it is not good for the engine.

Only way to get it running is to keep pedal pressed. Also with warm engime, it will not start until I press pedal to the floor what is also odd.

I also think that this is fuel related problem, but like I said, it squirts strongly when pressing pedal before start.

Is it possible that there is fuel in accelerator pump but not in bowl? Are they related? I don't know how this carb works, it there is separate "fuel storage" for accelerator pump or not.