73 Mopar 340 not pumping fuel

I made sure that the lines were not reversed. And I put a new carb on and couldn't get it started so I pulled the line off and that's when I realized it wasn't pumping fuel. It was pumping fuel just fine before I pulled the old carb off. And Im pretty sure the arm on the pump is below because I pulled the new pump off and saw the marks on top of the arm and when I was putting the pump on it wanted to pull down so when I tightened the bolts it pulled the pump up into the right spot.