Fuel Pump relay?

Car died while driving, wont start, but does start if I spray either in carburetor, I tested the leads to the fuel pump relay and only one lights up some one told me the computer may be out I can not get it to spit codes when I short the obd II leads

Ok I put power directly to the grey wire and the fuel pump did start working, so I closed the fuel line and directly jumped I with a key on power lead. It tried alittle to start but couldnt com[pletly turn over. Also my battery is going dead really fast I just got it of a charging machine 2 hours ago and it is already dead.

I had to pawn my computer to finish getting my car fixed. So this is where I am at, I determined that the fuel pump does work but the rely doesnt I hot wired the fuel pump and the throttle body and it will turn over but not stay running. I am going to buy and rebuilt computer and a fuel pump realy. No this car is very old with alot of gerry rigging. My question is that there 'll be a message on the back of the computer that any resistance lesser than 20 ohms will destroy the new computer. How do I prevent this from happining as I dont understand ohms or electrical principals yet?