I don't remember you saying anything about this. How have you restricted the pump?
Also, I noticed from the picture that you may have one of the suction lines closed. Is that the case and if so, is the 20 PSI clean filter pressure when that port is closed?
Also, what was the model # of your original pump (e.g. WF-4 or WF-24)?
All of these things can make a big difference in the operating point of the pump.
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