clean88coupe

Hey! So I was out of town and while gone had sevre thunderstorms pass over and flooded the streets. My car is lowered so did'nt help. Water was about half over the rim. Got home two days later and about 4 inches of water inside the car. Vacuumed it out. Tried to start and just cranking. Popped in my spare fuel pump relay and it started. Went on a road trip next day 900 miles. No problems. Go to start it today and no gas. I wiggle the relay around and can get it to stay on with no key in. So it pumps some fuel. Turn it over and fires but dies immediately.
Any recommendations? How to test what the problem maybe. Ever happen to anyone else before.