No fuel being pumped

I would get about 6 feet of 5/16 hose and a can of fresh gas, attached right at the pump.
If it will pull gas from the can and run the engine your problem is in the line going all the way back to the tank.
The pumps lever can stick in the down position but that is rare. When replacing the pump, removing the alt' lower adjust bolt and rotating it 180 degree up does help see what you' re working on. Rotating the engine so the pump ecentric is at it up position lessens the resistance and chance that you will cross thread one of its mounting holes.

The AirTec pumps from part stores are juck. Rockauto.com has Carter OEM pumps for a few dollar more.