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BTW, the reason I have the filter between the pump inlet and flow sensor is to dampen the pulses from the pump. Otherwise, and especially at low flow, those pulses will rock the flow sensor turbine wheel back and forth giving a falsely high flow reading.
Finn
Jim Sower wrote:
Transparent lines on ALL "suction" lines (upstream of firewall) would be edifying. Watch the bubbles as they appear and if/when they increase. Might try a pump just downstream of the selector valve after you've studied the bubbles as outlined above.
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