Originally Posted by
Biz
It is most likely an issue with slope or lack of slope on the mainline. If mainline is flat or there are any dips in the line at all that might gather sap, or rises that might create air pockets, the diaphragm pump will not work well, there will be air pockets and you can get surging. See if there is a way to modify the setup even temporarily to remove all sagging and flat spots, and see how it responds. Multiple 3/16" runs would immune to this effect even on flat ground when connected to a diaphragm pump so this might be an option to try another time if you can't fix the 3/4.
Dave
This was my thought as well. Check for sags in the main.
Camp Wokanda
Peoria Park District
2023 - 210 on 3/16 shurflo, sap storage shack w/ 1100 gallon tank - 123 gallons
2022 - 210 on 3/16 shurflo, homemade vac filter & water jacket canner - 104 gallons
2021 - 215 on 3/16 shurflo, added 2nd membrane to RO - 78 gallons
2020 - 210 on 3/16 shurflo, upgraded hp pump on RO - 66 gallons
2019 - 150 on 3/16 shurflo, Deer Run 125 dolly RO - 73 gallons
2018 - 120 on 3/16 shurflo, 2x6 raised flue w/hood, homemade arch w/ AUF & AOF - 34.5 gallons