Ok, got some {IMO} bad news.
Pump is fine... although it shakes more than I expect while sucking water through the winterization tube. Great water flow, it sucked a 1 gallon water jar dry pretty quick.
I can not blow or suck through the line connected to the fresh water tank. I did try both positions of the valve... just in case I failed plumbing valve 101 :)
RV mechanic friend said it's not unheard of for a water tank to not have the hole drilled all the way through for the nipple to attach to the water pump.
Thank you for all the suggestions, but this is a dealer item :(
