What diameter did you use. Years ago I had an issue, I had used a 1/2" high temp silicone hose, with about a 8' length, it flattened from the suction but did not fully collapse. I later changed to 1" high temp silicone hose, with no issues. Both had a 3/8" gear pump, I now have an air diaphragm pump which moves the syrup faster if I open the air supply full open, but I run it on medium flow at about 50 PSI.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.