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Abstract. Yields of sugar maple sap collected from three plastic pipeline systems by gravity, vacuum pump, and a vacuum pump with a transfer tank were compared during 2 years in northern Vermont.The transfer system yielded 27 percent more sap one year and 17 percent more the next year.Higher vacuum levels at the tapholes were observed in the transfer system.he transfer system yielded 27 percent more sap one year and 17 percent more the next year. Higher vacuum levels at the tapholes were observed in the transfer system.
We should point out, however, that the sugar concentration of the sap can vary from 1 percent to as high as 5 percent, and this will drastically impact how much sap it takes to produce a gallon of syrup. For example, 2 percent sap takes 40 gallons to make one gallon of syrup â but you seldom get a tree that makes that. It tends to vary through the season, also, with sugar concentration falling lower as the season progresses. Just something to think about!