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I'm a plumber and at times we use water to test piping (usually underground cast iron) for inspectors. Our test is 10 foot of waster which gives us 4.34 psi at the bottom. Water will give you .434 psi per foot of rise. Since gasoline is lighter than water, My question is how many feet of rise is needed to get 2 psi using gasoline ? Thanks Mike 

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In rough numbers water is 8.4 Pounds per gallon, Gasoline 6 pounds per gallon. Do the math..............Bob

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