None.
A pound is a measure of mass. A gallon is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a gallon of air. How many pounds? Next consider a gallon of Mercury. How many pounds?
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3,131.25 pounds at 8.35 pounds per gallon.
3,129.52 pounds, at 1,000 kg/m3, 2.20462 pounds per kg, 3.28084 ft/m3 .