Electrical fuel pump issue, URGENT
 

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?

U getting power at the relay?

To test this, would I just test for 12v at the relay socket with ecu plugged in and key in the ON position?

So I tested at the relay, I am getting power there. I noticed that the EGI relay clicks, but the EGI pump relay does nothing with the key in the ON position.

Also, I tested for power at the pig tail. I got about 7v in the two middle slots, and 0v from the other 3.

Any ideas?

Dumb question. You have power at the pump or no?

Just hardwire it aka kill switch and cut off the purple and black wire going to the pin 104, Here's the write up for it : How TO: 240sx Hardwire Fuel Pump : 240SX Technical Forum I had the same probleme and worked great for me.

^^^that may be the easiest way. And works just fine

I am not getting power at the 12v wire in the back. I am, however, getting 12v at the fuse. So between the fuse and thE pigtail in thE back is my problem. I am currently chasing down that wire from the back through the cabin and see what I get.
If I cannot figure this out by tonight, I will have to hardware it for transportation purposes.

Fixed.
There was an electrical short in the sending unit of the fuel pump