I have a little experience with those combo carb/pumps.
I would say that indeed you are not pumping fuel.
Possibly a diaphragm got damaged or a gasket is torn.
I'm remembering on one I worked on, a little spring
got lost/forgotten and I had to re do it as it would not pump.
I would do a little more online searching for a diagram on the assy of the pump part of that carb.
also make sure nothing is under the little check valves or it will not pump.
Check to make sure the vacuum line to the block is good and not old/cracked/split
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