So I don't really understand what you're saying. You tested everything, but it's not working. So you have power at the input to the fuel pump relay, and the relay is getting turned on when the relay coil is energized? So if the relay is getting power, and it's turning on, either you have power on the relay output or you don't. If you don't, replace the relay. If you do, the problem is obviously between the relay and the fuel pump if the fuel pump is not turning on. So you're obviously not checking everything out.

So what have you actually checked out?


When you're powering the fuel pump from a different power source, where are you actually connecting the power source?