Be careful, there are 2 fuel pumps back there. One internal to the tank which works as a supply pump to the external fuel pump by the tank. If either one of those doesn't work then the engine may not get fuel. Also, make sure your fuel pump(s) relay is working. Those can sometimes fail on you.
Can you give us a run down of what you have tried so far? It will help us to understand so that we can help you.