The other week my car was running fine, it was.

The other week my car was running fine, it was a fairly warm day got to my destination got out went to leave later on car would not start car was cooled down, sounded like the fuel pump replaced the pump and the filter checked the lines all seemed well until a couple of days ago when the engine warms up you put your foot down on the accelerator and it seems to die idles fine and starts fine, but you could be driving along and all of a sudden no response PLEASE PLEASE help