If you installed a new pump and it still does the same thing, sounds like you might have an air leak in the line to your fresh water tank or your tank is empty. When you winterized, could you have blown apart a connection in the water line? If there was too much pressure pushing out the water, this could have easily happened.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP