allenms240

Hello all,
Last night I was working on my car, fixing a fuel leak I had. When I put my sending unit back on, I believe the power line was crushed between the unit and the tank. I went to start my car, and the fuel pump wouldn't work. I shorted out the circuit.
The EGI relays have been replaced, so has the blown fuel pump fuse. I have bench tested the actual pump and the pigtail from the sending unit and they are working properly.
I tested continuity from pin 104 (fuel pump relay wire) to the relay pin and confirmed the wire wasn't broken between those two spots. I also tested between the relay to the fuse, which showed continuity. I have also tried to bypass the relay to no avail.

Now I noticed that when my pigtail for the fuel pump isn't plugged in, my car and dash lights turn on correctly without lag. When I plug it in and turn the key to ON position from ACC, everything in the car shuts off for about 3-5 seconds, and then comes on.
I'm not quite sure what to diagnose now. Could it be the ECU, how would I test that? What else is there I can test?