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How much is vacuum in psi?

Updated: 9/16/2023
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Q: How much is vacuum in psi?
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What is 4.45 psi in a vacuum?

psi = pounds per square inch, a measure of pressure a vacuum is an absence of pressure.


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From the HAYNES MANUAL: With regulator vacuum hose attached: 31-38 psi ::: With regulator vacuum hose disconnected: 40-47 psi.


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For a 1994 Ford Explorer - 4.0 L : key on / engine off ( 35 to 45 PSI ) at idle with vacuum hose connected ( 30 to 35 PSI ) at idle with vacuum hose disconnected ( 35 to 45 PSI ) according to my Haynes repair manual


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Typically you only need to backwash when your filter's PSI is double its starting PSI level. For example, mine starting PSI is between 7 and 12, so when it gets to between 15 and 20 PSI I'll backwash.


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Atmospheric pressure at sea level is 14.7 pounds per square inch.Psia(pounds per square inch absolute) is also 14.7 pounds per square inch.However psia starts with zero pounds per square inch at 29.92 in Hg which is a vacuum measurement (absolute vacuum) in inches of mercury or in Hg.14.7 psi atmospheric pressure is as high as atmosphere pressure will ever reach. all measurements below that is a vacuum. That is where psia come in. It can start measurements in a vacuum and continue with the same unit of measurement after it comes out of the vacuum at 14.7 psi.