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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.
For example, if we found that we cooked down exactly 40 gallons of sap to produce one gallon of syrup we would know that the sugar concentration in the sap was approximately 2.15% ([sap sugar] = 86/40). Maple sap has little maple flavor.