The carb on my latest purchase will not pump gas through the jets and will not start without being primed after sitting overnight. I assume the accelerator pump is not working but not sure. If it is the pump what should I look for as the likely cause and are they easy to fix?

‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500