2021.5 195 Water Pump not pulling from tank

We pick up the camper a couple of week ago and this is the only thing I did not test in four days of camping.  I planned to flush the fresh water tank to day but the pump would not pull water.  I discovered that since they winterized the unit at the factory (and the dealer half un-winterized it; water heater bypass off) the intake bypass was on to pull water from the alternate hose for anti-freeze.  Turned the bypass off with the fresh water tank completely full and no water.  Turn the bypass on and put the anti-freeze hose in a pail of water and the pump works fine.  Tried moving the bypass valve off and on with the pump on in case there was a priming issue.  I drained the water tank and refilled a couple of time to see if there was plastic shavings or junk in the tank but found none that came out when draining though a fine mesh bag.