Gary on mine when I turned the key on you could hear the pump in the tank run.
I thought the way it worked was when you keyed on it started the pump and once started in 20or 30 seconds the oil pressure switch took over and if you were to lose oil pressure the pump stopped. Not 100% shure but that's how I thought it worked. I'm shure someone with more no how will chime in.
If you want to change your pump when you get back I have a motorcycle Jack that helps a lot. The less fuel the better.
It's only four bolts and two straps holding it up. I can give you a hand if you want.
We are out right now and will be back on the 23rd.