Alright, so lately I've been having this odd issue with my fuel pump where it wouldn't turn on when we started the car, therefore the car wouldn't start. We pinpointed it down to a faulty fuel pump, replaced the pump, and it seemed alright, until another issue appeared, which was happening before but not as profound. Now, the same issue is happening before, but a way I've found to fix it temporarily is to pull the fuel pump relay and then re-insert it and she would crank right back up. Now sometimes, the blazer will just shut off when I'm driving, which is definitely not a good thing... So we have been trying to find out why this is happening, but I was wondering if any of you had any expire ended with this issue or have any advice on what we could do to solve this issue. Could it be an electrical short?

 

Sounds like a short in the ignition switch or bad relay.