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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.
In general, it takes about 40 gallons of sap to make one gallon of maple syrup. The sugar content of the syrup differs from year to year. Sometimes it takes more and somet â¦ imes less. Weather is a factor.