Wont start

We just purchased car 3 months ago. Had issues from 1week after purchase. Car had been broken into and I believe keys were not original. Our first troubles started with it not starting, we put in New distributor, New idle air control, the problem would clear for a few days then randomly no start. We noticed if we went through starting procedures slowly like waiting to hear fuel pump and for lights to turn off on dash we would not have issue. Until it rained. Now we have a No start at all and we no longer hear fuel pump engaging, replaced main relay still no start. Check engine light does not go off and also starts flashing D4. Code 14. Because we were doing the key only to on position til lights went off to turn to start, if lights didn't go off we would turn key off and recycle to on only again sometime doing this several times and no luck. When reading up on security system I'm now confused wondering if it was shuting starter down cuz we kept trying to start this way when we were actually resetting keys programming. In the meantime we have dropped the tank and replacing fuel pump. When back together hopefully it will solve. If not I dont know what to do next. I want to disconnect secuity systems wires under drivers seat but can it just be unplugged to disarm it? Will let you know if fuel pump replacement works