About 8.35 pounds for one US gallon of water.
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A gallon of water weighs approximately 8.34 pounds at sea level.
Water weighs about 8.34 pounds per gallon. So, 40 gallons of water would weigh approximately 334.4 pounds.
At 17oC one gallon of water weighs 4.536kg.
Weight of Imperial Gallon of Water1 gallon [UK] = 1.201 gallon [US, liquid]One US gallon weighs 8.34 pounds, so an imperial gallon weighs about 16.6 percent more, or almost exactly 10 pounds.
Number 2 or red diesel weighs 8.33 pounds per gallon. It is slightly heavier than water which weighs 8.13 pounds per gallon.