I had the fresh water tank on our 2016 Axis fill up completely overnight while hooked up at the San Onofre campground. Yes, we had a water pressure regulator. I believe that there were some plastic shavings in the system since I later found a good number of the shavings in the cup of the line water filter. I have not had the problem since I cleaned the filter but I have emptied the tank completely several times and still find some shavings getting into the filter cup. I have read where others have blamed the internal valve on the water pump. This could also be the problem but I will probably just turn off the valve coming out of the fresh water tank when hooked up to city water in the future. I don't have much confidence that replacing the water pump with another would change the situation.
On another note, I recently added a ShurFlo air accumulator tank to the water system which caused me to understand the water system much better than I did before.
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