Factor,
This is a common problem. I have heard of many trailers, including mine, that come from the factory with the pump input valve set to the "Winterizing" position. I was lucky to just stumble across the valve while troubleshooting this problem. Glad it was an easy fix for us. Wish the factory would reverse this valve before shipment.
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Jim and Connie w/3 lb. Chihuahua= Nugget
2016 Rockwood Ultra-Lite 2608WS
2004 Dodge Ram 2500
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