My 1996 Chevy Blazer will not start

I change my fuel pump and that took care of that problem now my truck is running good again

There is three basic thing you need for an engine to run, so let start with number one do you have spark to all cylinders. Yes ok two do you have fuel being delivered to all cylinder, could be your problem. Easy way to check it buy some intake/carb cleaner spary the intake only not the mass air flow sensor. And hit the key if it starts you have no fuel.