Check valve
Same problem on my unit, used pump to flush it, no help. Finally turned off city water, turned on pump and opened winterizing valve to suck in air briefly. This has fixed the problem, for now. Seems to have cleaned valve.
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5th Wheel: 2015 Prime Time, Crusader 295RST
2017 Dodge 3500 4x4 Long Box Cummins 6.7
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