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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.
The Rule of 86. How many gallons of sap does it take to make one gallon of maple syrup? Using the Rule of 86, you can figure that the number of gallons of sap you need to produce one gallon of syrup is equal to 86 gallons divided by the percent of sugar in the sap. So if you start with sap that is 2% sugar, you would need to evaporate 43 gallons of water (86 gallons / 2% = 43 gallons) to make one gallon of syrup.