Fuel pump not getting power when the ignition switch is turned

We thought that maybe it was the crankshaft position sensor, I ordered a new one but still having the same issue. I found a box under the passenger seat, and when my friend put power to it the fuel pump turned on. Does anyone know what this box is and how does it connect to the fuel pump? At this point we are thinking that it's the ECM that's failing to start the fuel pump. Has anyone ran into this problem or know of anything else that can cause a fuel pump to get no power? Fuses are good, and the car turns over when a direct wire is put to the pump. It's looking like it's dead wire (no power) from the fuse to the back seat where the pump is located.