No gas to carburetor

[SevenKeys]

Cleaned petcock assembly and carburetor, reattached and secured hoses, installed new starter valve set. No gas flow from full tank. Engine cranks with starter button but no gas. This is a vacuum system but does it need to be primed somehow? Could my fuel filter screen be clogged? How do I remove it from inside the tank? It doesn't come out with the petcock assembly.

[ClemSpree]

Its just behind the petcock(in the tank) and IIRC theres a little rubber ring there too, sometimes you have to fish it out. Some petcocks(not sure on Spree) can be assembled incorrectly, apply light vacuum to the vacuum side and see if fuel flows. Make sure you have vac and gas lines in correct locations.