I have been having endless problems with the pumps attached to my tank system. I have a 165 gallon tank with two Flojet 12 volt pumps. The pumps are 2.0 GPM, 100 PSI. I have recently added a motor controller to slow down the pumps. I am running 3/16" ID pole hose straight out of the pump, generally about 200 feet of hose, sometimes an extra 50-100 feet.
I have used this setup for 5 years now, with 4 or 5 different pumps (always the same Flojet model & specs.) I had to replace both pumps over the winter because I allowed them to freeze and they broke. Ever since, I have had trouble with cycling due to back-pressure. The only way I could get the pumps to stop cycling was to adjust the pressure switch.
My pumps are running hotter than I’ve ever noticed before, even while running slower with the motor controller running at about 2/3 speed. The pumps will shut-down for a couple of minutes when they get hot.
I am looking for any help to solve this. I have never had any issues with this setup for 5 years and now, all-of-a-sudden, I am having nothing but problems. I just need them to work so I don’t worry about when they will fail. It’s busy and I don’t have time for this.