Did you change it, or did ford? If you changed it, look at the old pump and see if it has a sock hanging off one side of the bottom. If not, look at the bottom of the pump and see if there is a circular screen covering the inlet. If there is a space for one, and the screen is not in it, you know where is probably fell off at.... Check it for fuel leaks, fuel pressure, maf performace, baffles in the tank, etc. It's probably pretty obvious what's wrong....