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Thread: Shurflo diaphragm pump vacuum

  1. #1
    Join Date
    Mar 2021

    Default Shurflo diaphragm pump vacuum

    Shurflo diaphragm pump vacuum

    I only recently learned of the use if a shurflo diaphragm pump to create vacuum on 3/16 lines. Now I learn this is in widespread use by surfing here..

    1. What can I expect for increased yield by properly using this system.

    2. Any advice instructions or diagrams for properly wiring and plumbing this system would be appreciated. I intend to run 2 off of 12v deep cell car batteries.


  2. #2
    Join Date
    Feb 2019
    Murrysville, Pennsylvania


    The yield increase depends on multiple factors such as:
    (1) age of system- new install has great yield in 1st year
    (2) amount of elevation drop (the more drop = more vacuum = more yield)
    (3) how leak tight the system is
    (4) length of laterals - friction losses on longer runs
    (5) number of taps per lateral - too few or too many hurt you.
    (6) weather 

    I did 3/16 on a diaphragm pump for the first time this year. I used an aquatec 8852 instead of a shurflo because I had it from a smaller RO I used to have. It worked amazing. Here are some numbers for comparison:
    (1) better seasons on buckets yielded 0.17 gal of syrup per tap. Vacuum using a diaphragm pump like a shurflo put me at 0.275 gal/tap of syrup. ~62% increase in yield.
    (2) local friend (within 3 miles) who tapped same day, and pulled taps on the same day, and had comparable number of taps and was on short 5/16 drop tubes into buckets got 0.055 gal/tap of syrup. In years past our syrup/tap were always very comparable. This year I got 0.275 gal/tap. That's 500% increase.
    (3) plenty of actual studies show average of double yield if you achieve good vacuum given the variables above.

    Neither of my numbers are from perfect controlled experiments, but it is more than enough to convince me there is significant yield increase from using vacuum on 3/16 if you have good slope already.

    Was able to get ~25 inHG with over 100ft of drop from top to bottom. Had over 80 taps on 5 lines, some up to 1100 ft long. Averaged more than 1 gal of sap per tap per day. 19 gal of sap per tap on a short season.


    Last edited by DRoseum; 04-03-2021 at 08:24 PM.
    D. Roseum
    ~100 taps on 3/16 custom temp controlled vacuum; custom nat gas evap with temp and level controllers; homemade RO; SL SS filter press
    2021: 27.1 gallons

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