The pump should have a ball valve inline to switch it from city water to fresh water tank. This needs to be switched when winterizing as well to pump the antifreeze through the lines.
Chuck and Joanne
2014 Flagstaff Super Lite Classic 27RLWS Emerald
2013 Dodge 2500 4x4 Laramie Crew
Equal-i-zer 1200/12,000 4-point WDH