Its a dc powered by a 12v dc led power box. 12v output was 12.5 volts on my meter. Yes I have a recirculation line in place.

I checked all my lines today and nothing was really moving. I do have a couple lines with sap in them but not moving quickly. Again I blocked off all lines one at a time and the vac guages show them holding vacuum. I also blocked off/ isolated the the pump, drew vacuum, and it maintained the vacuum it had pulled. The other day the sap ran and I saw 14 inches. Yesterday and the day before it ran again but only showed 10-11 inches. Yes today is/ was slow. I'm still thinking that I might have a bad diaphragm.