Will not start after replacing fuel pump

Won’t start only with starting fluid. Replaced fuel pump runs for a few seconds on starting fluid. What should I check for? This is my sons car, this all started on day a about four months ago he drove to the store about five miles away came out it would not start. Had it towed home had to wait for the snow to melt so we could work on it. Checked the fuses they seem fine not sure about relay don’t have a way to check it out. Used my OBD tester it said nothing was stored in the system. But he had the battery disconnected from sometime not sure what to check now.