that's kind of strange. if the car ran with the fuel tank down and then you bolt it up but you still get 47 psi from the pump, there's nothing else a fuel pump does. If you are getting power to the pump and the pump pressurizes the fuel rail to 47 psi that's it. it's working. you could release the rail pressure and cycle the key to verify that you have full pressure again but if it cycles up to spec it shouldn't be a fuel pump problem. Have you checked all the wiring around the tank to make sure no wires are pinched anywhere? or tried lowering the tank back down again to see it starts then?
have you checked to see if any fuses are blown?
Verify that you have ignition spark and injector pulse while cranking. that should be the next piece of the puzzle to look at. if you don't have injector pulse but do have spark I would look at the security
system even if the light does not come on. if you have no spark and no injector pulse I would look at the crank sensor, pcm or a blown fuse