hotchickwitha454

I have a 93 burban with a 454 engine. A few months ago the fuel pump went out so we put in a new one of the same type. Then it started acting fuel starved. We found a leak and fixed it. Doing that involved changing the sending unit as well as lines from the sending unit to the pump (Holly inline pump). The truck ran fine for 2 days and then started acting fuel starved again. My husband put a self priming pump between the tank and the holly pump to see if that would help, it did not. Does anyone know what the issue could be?