Mailing List lml@lancaironline.net Message #47246
From: Gary Casey <glcasey@adelphia.net>
Sender: <marv@lancaironline.net>
Subject: Re: Lancair 320 low fuel pressure
Date: Mon, 12 May 2008 16:41:06 -0400
To: <lml@lancaironline.net>
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Gerard,
The fact that your pressure consistently comes back up after 15 minutes points to the fuel pressure gage or sending unit having a restricted vent.  It might be that in your case the reference pressure takes about 15 minutes instead of the seconds that it should take.  The gage has to have some way to vent the back side.
Gary Casey


My fuel pressure guage behave exactly the same way-I put it down to vapour lock.
After about 15 minutes it comes back to middle of the green arc.


Is this the Bernoulli's principle at work in addition to some vapour lock  ?

"In fluid dynamics, Bernoulli's principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's gravitational potential energy.[1] Bernoulli's principle is named after the inventor Daniel Bernoulli."



Gerard
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