Is there any history to this? Meaning has anyone made any repairs other then you rewiring this? This is not normal. The only way the fuel pump can get voltage to turn on is if this has been jumped or there is a short to voltage. The way to test this is go to the pump and check for voltage with the key off and on. There should only be voltage when the key is on. Clearly if it starts and runs then it has power when the key is on but we need to make sure if someone ran a wire to it to bypass the relay that it is not on all the time. This is a safety issue because you clearly don't want your fuel system pressurized all the time.
What I suspect is someone has run a new wire to this and that is why you are getting voltage even when the relay is out. As long as there is only voltage there when the key is on, then it is okay. However, if this is the case, I bet there is an issue with the control side of the relay and the PCM is not energizing it and instead of replacing the PCM, they just hard wired it to a wire that is only on when the key is on. This is pretty common but eliminates the relay which can cause confusion for those that are not aware of it.
Let me know if this makes sense. Thanks
Sunday, January 3rd, 2021 AT 6:12 PM