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The pumps are designed to run without water as they are self priming.
They are regulated to stop pumping when water is present and a predetermined pressure is met on the out line. IE 55 - 65 PSI. They kick back on when the water pressure drops below the set pressure.
Just purchased a new pump for our camper as the original owner newer winterized it properly and the pump developed a hair line crack in the out line. Pump was only $56 off ebay.
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