I had the same exact happen on my Mustang Gt with the 4.6 v8. My wife drove it home from a trip at the beach and no start, just crank and crank. The dealer wanted $800 to drop the tank and put in the fuel pump. Said iy was a 4 hr job. I bought the pump and not even done this before, had it done in 45 min even with a half tank of fuel. No more problems. On a separate note, the crank shaft sensor went out and did the same thing. It would only crank. Towed it to the dealer and it fired right up. A small oil leak made the crank shaft sensor short out. But I think its the pump, they are notorious for that.