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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 does it take to produce one gallon of syrup?     It takes about 40-50 gallons of sap to produce one gallon of syrup. Each tap yields an average â¦ of 10-20 gallons of sap per season: that yields one quart to 1/2 gallon of syrup per single tap tree.