Why isn’t fuel going to the carb?

Marcohotrod said
Wrong filter. Carburetors do not use a return fuel line

Actually YOU CAN and carburetors (some) DID HAVE a return line. Hemi cars and my 440-6 had them from the factory.

BUT THIS FILTER is situated wrongly.........the return must be "up" to trap air at the top

And whatever it is hooked up to is wrong. A SEPARATE line must be added to use these, or else the vent system re-worked.