What is the reason that my chevy will not start? on 1994 Chevrolet S10 Blazer

I have a 1997 S10 Blazer 4.0 Vortec Well the fuel pump went out we replaced it ourselves and then it was the wrong one so we replaced it with another one and it ran for about a week or two and then quit on me again the fuel pump starts up and all but the Blazer will not start my husband says it is the fuel pump again but he wires it direct and it pumps and the pressure is good Some people are saying it is the pull down could this be it?

try to do a pressure test . if you wire it direct it will not crank because the computer will not read that it is getting fuel