Mine fills with rainwater when we have driving rain, I determined it is on the drivers side. First happened when sitting through a hurricane last fall. I think it is coming in through the external furnace vent then down through the heater outlet on top of my tanks. In my case I know it is not tank water as it happens when stored, empty.
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Butch and Kathy
2016 3160RL Legacy, Sailun S637, Centramatic Balancers, 2-T105s, Amish Refrigeration, ARPrv, SoftStartRV, FlexArmor roof
2016 F350 6.7L SRW
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