A ZDZ 60RV engine that doesn't start

[Franco Gozzi]

Can anyone tell me why the fuel cannot flow into my ZDZ 60RV?
So far I have disassembled the carburettor and I could apparently find nothing wrong or broken.
The carburettor (BING diaphagm type) can't simply suck, whichever level of the tank, as it doesn't generate any vacuum capable to take the gas in.

Thanks a lot in advance for your help.

[Franco Gozzi]

Yes, thanks to a friend down here I was able to find what was causing the problem.
He said to me: "Are you sure that the choke completely closes the intake, so that the piston movement can create enough vacuum when you flip the porp?".
In fact it was not. Due to an imperfect choke servo adjustment that is what has exactly happened.
After I properly set the servo thrown, İ rotated the prop a few times then at the very first flip the engine gave a rich stroke and at the second it started.

Solutions are much easier than what it seems...