I de-winterized the trailer(my first time since owning it) and notice that the pump runs for a while when I fill the tank and turn on the pump. There are no leaks, and the faucets were off. I figured it was filling the hot water tank, but I didn't think it would take more than 5 MIn. I finally shut the pump off and thought I would wait tp hear from ya'll.
Make sure you run water thru all out lets, Out side shower is one you might be forgeting, Toilet. I always open the hot water vent as well. If there is air in the system the pump will still want to run a lot as it is trying to compress air and not water. Keep runing the water tru the system.