anyone ever have a fuel pump go bad? only sending fuel to one carb
It could be plugged. Take it out of the sled and pull it apart to see if the diaphragms and valves look alright. I would bet you have a torn diaphragm. Make sure before you take it apart to make some match marks on the top and side so you can put it back together exactly how it was. Pay attention and work carefully inside the fuel pump to remember where all the pieces and springs and such go.