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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.
How much sap do you need? Sap starts with a sugar content between 1 percent and 4 percent. The percentage of sugar content tells us approximately how many gallons of sap it will take to make a gallon of syrup. For example, if the sap is 1 percent sugar, we would need 86 gallons of sap for one gallon of syrup. If the sugar content is 3 percent, we would only need 28.6 gallons of sap. The yield of sap varies from tree to tree, and is also dependent on weather. On average, the sap collected from one tree will make one quart of syrup.