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Old 11-03-2019, 03:17 PM   #5
JRTJH
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Join Date: Mar 2011
Location: Gaylord
Posts: 26,841
If, after you've bled all the air out of the lines, the pump still cycles, I'd consider the pump diaphragm (in the pump head) as the most probable cause. Pressure will "bleed through the pump head" if there's even a single bit of debris in any of the roller cavities. You can take it apart and clean it. PAY ATTENTION TO WHAT GOES WHERE !!! or you can buy a new pump (assuming it's a FloJet pump) for around $50. A new pump head is nearly the same price and I'd guess that if the pump has not been regularly used, there's some "dry cracks and loss of flexibility" in the pump diaphragm.
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