Did I ruin my water pump?
My dealer told me not to run the water pump if the fresh tank was empty; he said it would burn out the pump. But I got confused and ran it for a day or two while tied into a a city water line before a neighbor told me to turn it off.
When I filled the fresh water tank, I did get water from the taps and shower with the pump on, though I have no way of judging if the water pressure was affected.
Did I shorten the life of my pump? Weaken it? or did I get lucky?