With two fresh water tanks, I can't think of a logical way they'd be connected that doesn't automatically equalize their levels. In other words, I don't think the pump is transferring from one tank to the other. The pump should be connected flowing *away* from the tank(s) toward your fixtures.
What happens after the pump stops pumping for that hour? Does it eventually come back on? If so, for how long?
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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