Mailing List flyrotary@lancaironline.net Message #5852
From: Scott Stout <squiggles@yahoo.com>
Subject: RE: [FlyRotary] Re: EFI Fuel Pressure
Date: Fri, 13 Feb 2004 08:03:24 -0500
To: <flyrotary@lancaironline.net>
OK...Before I run too far off topic, what is the pressure on the fuel rail?  From the responses to the original post it seems safe to assume even if I return to the bottom of the 29 gallon( 2 14.5 gallon tanks ) tanks the pressure generated by the fuel pump will easily overcome this resistance.


Now venturing down the pressure path...I am confused...How can the weight/volume of the fuel above the measuring point be ignored? So,  I have a 1 gallon 12 inch square bucket filled with 1 gallon of fuel, it weighs 6 pounds today.  If I raise this bucket 25 inches above the ground, attach a 25" vertical tube to the bottom of the bucket and measure the pressure I will have 1 psi of pressure?


Now I change the amount of fuel I want to have 25 inches off the ground to 2 gallons.  However, I also change the square bucket to be big enough to hold the 2 gallons so that the fuel level is the same as the original 1 gallon bucket.  Thus, the height of the fuel in the bucket is the same whether it is 1 gallon or 2 gallons.  Does the pressure at the bottom of the 25 inch tube measure something other than 1psi?  2psi?  1.5psi?


Yep...Definitely time for that 2nd cup of coffee...


Thanx for the help...

-Scott

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