When you say carb work ... do you mean they rebuilt it? New gaskets? New diaphragm? Cleaned all the jets and passages? It they just adjusted idle and/enrichener?
Did you also pop the gas cap to check for a vacuum? It can happen. If you have a vacuum petcock, that too has a vaccine line and if it is pinched or has a hole the fuel will not flow.
Sent from my iPhone using Tapatalk