Well folks, it was definitely the 3-way valve that selects between tank fill and city water supply. I pulled the panel yet again, pressured up the system, and then disconnected the pump inlet hose and the tank fill supply hose in turn. Nothing from the pump. Steady little stream from the valve to the tank line. Just for grins, I put the new pump in. It made no difference and still "burped" every couple of minutes. But it is a nice quiet new pump, so no loss there and I have a good spare.
Could not locate a local source for a Watts valve. I am getting an Apollo valve from a Florida supplier. The valve looks pretty similar-may have to mod the mounting screw holes but it will do the trick I am sure. In case anyone cares, the Watts was a series B6780 and the Apollo is a series 70-600.
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2017 Coachmen Orion, Ford Transit 3.7L: previous
'09 Pleasure Way Lexor, '05 NRV Dolphin 5342
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