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Back up gas fuel pump


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Posting on this site because many are familiar with hose sizes and what pressures do to floe.  I want to install a back up fuel pump in a small motor home.  Gas...not diesel.  On a small 5.4 trition.  I can work out most of the plumbing but I'm stuck on figuring out how much gas I can get through a certain size line.  I have a gas line much smaller in size that feeds a generator.  Much smaller than gas line to engine under the hood.  Would be great if I could use this small line.


What is it called...figuiring out how much fluid you can a certain size line at so much pressure?

If someone would give me a hint...I could google from there, but don't know what to look up.



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