X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 12 May 2008 16:41:06 -0400 Message-ID: X-Original-Return-Path: Received: from mta16.adelphia.net ([68.168.78.211] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2918599 for lml@lancaironline.net; Mon, 12 May 2008 09:24:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.211; envelope-from=glcasey@adelphia.net Received: from [76.89.163.133] by mta16.adelphia.net (InterMail vM.6.01.05.04 201-2131-123-105-20051025) with ESMTP id <20080512132312.RPFD11947.mta16.adelphia.net@[76.89.163.133]> for ; Mon, 12 May 2008 09:23:12 -0400 Mime-Version: 1.0 (Apple Message framework v753) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-102-363171677 X-Original-Message-Id: From: Gary Casey Subject: Re: Lancair 320 low fuel pressure X-Original-Date: Mon, 12 May 2008 06:23:25 -0700 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.753) --Apple-Mail-102-363171677 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed 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 --Apple-Mail-102-363171677 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 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. =A0It might be that in your case the reference pressure = takes about 15 minutes instead of the seconds that it should take. =A0The = 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=A0 ?

"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."


= --Apple-Mail-102-363171677--