Why isn’t fuel going to the carb?

Go to Wal Mart and pick up a Fram plastic See through filter, put it on and lose that "Tee" filter. Then you will be able to see gas in the filter. It could be a bad defective filter, i have seen that before. In the meanwhile crank the car a few seconds pull the pump side of the hose at filter and see if gas squirts out under pressure.