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rohrmann, thank you for your response. The trailer is a 2021 Montana 3813MS. We just purchased the trailer - trading in a 2004 JAYCO. This is the first time that we have attempted to use the water system. I filled the on-board tank with the fill valve in the convenience center. The switch was set to fill and I let the water run until there was water coming from the overflow hose in the back. I then turned the switch to normal flow. The Winterizer switch is off as is the water heater bypass. I let the system run for - what seemed like an eternity. The pump motor never shut off which suggests there is no pressure build-up in the water lines.
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