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ExPatNW, Your not the only one having issues with this. There are a couple other threads already on the subject. We had the EXACT same issue on our brand new 381TH. There has been some discussion that Keystone may actually be about to recall the check valve on the "winterize" connection as it doesn't work well. I think some of the suggestions about turning the screens around on that connection are working toward holding that valve open? This is on our list for the dealer when we take our rig in for its first inspection.
The other three suggestions are:
1. Leave water in pump so it is primed.
2. Make sure connections are tight so you don't suck air into pump and air lock it.
3. Keep the anti freeze above the pump level so that gravity will help feed the pump. One person even suggested using a 5 gallon bucket with a connection on the bottom of it sitting on a tall ladder. That might be overkill but it should work for sure!
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