My 1990 Chevrolet cavalier cranks but will not start The fuel pump will run after placing jumpper wire on pump tester No voltage at pump relay I replaced fuel relay Whats wrong?

Its this little box thingy. I don't know the name of it. It controls something. Its about 2 inches and looks kind of like an L Shape but not quite. It has something to do with the starting system and is located near the drivers side front wheel. It has become faulty and you're going to need to replace it. Once you figure out what I'm talking about you'll have your answer!