Hello My name is Eric and I have a 2000 2500. I recently have swapped my cabs from my parts truck on to my truck And the only thing that I changed would be the ignition it stayed with the new cab. I have a FASS pull system. Ever since I've done the swap when I turn my key over my fuel pump doesn't run. I over rode everything in rand the fuel pump straight to a switch So when I wanna start my truck I flip the switch. Well I truck still doesn't start feel pump runs I have gone in tested all the wires The The system And it seems like The wire from the side of the block (from ecm) Isn't telling the relay To run the fuel pump or send power that way I'm getting fuel To the injector pump and the Fuel pump is running. But I don't understand why this bypass didn't work If anybody has any inside on this I would appreciate it?