On our recent trip to Colorado I noticed this during a change over from city to fresh water while I was draining tanks. After I was finished with that I switched back over to city and I heard water running through the plumbing. I do the regular checks to make sure the interior faucets were turned off, etc. They were. So I wait and sure enough the fresh water tank overflow starts to dump.... I poked around for a check valve around the pump and all I found was a inlet filter which I checked and it had some plastic debris in it (I assume from the build process). Is there a check valve located someplace that I'm overlooking?? Could there be a piece of this plastic in the Anderson valve??

damn I'm getting tired of this...

Kevin

PS the new refrigerator worked great and no more LP gas leak.