Sender: <marv@lancaironline.net>
To:  lml@lancaironline.net
Date: Sun, 22 Mar 2009 16:13:59 -0400
Message-ID: <redirect-3555656@logan.com>
Received-SPF: none
 receiver=logan.com; client-ip=206.190.56.20; envelope-from=casey.gary@yahoo.com
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=yahoo.com;
  h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type;
  b=wd/fGFzVRkl47+aHWDYOglaEn21DhjKNNc8atw6d3BgrqaMAR40AMvobQeKWYeREtugZRituJdsuFdg6Sl+GmHKqGlGZTI1+DVVAN4cs1lSE/uEe9X6Zet8DxPLqNagF7luK/3R5OhJPLG0raX9jXVERJHBhJRtbbmJB5JJ1fB8=;
References: <list-3554634@logan.com>
From: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Fuel selector Valve question
In-Reply-To: <list-3554634@logan.com>
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="0-122094960-1237638825=:78811"


--0-122094960-1237638825=:78811
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

Bryan,=0AI'm afraid the setup you mention would be troublesome.  I don't kn=
ow if a 1/4 line is adequate or not, so I'll pass on that.  Generally it is=
 undesirable to connect both tanks together in a low-wing plane, and this m=
ight be especially true of one with low dihedral.  The problem is that even=
 a small difference in fuel level could result, as the fuel level gets low,=
 in one tank unporting, allowing air to enter the system.  As soon as air g=
ets in the other tank will likely stop feeding entirely, shutting off the f=
uel supply.  You could probably feed off both down to some level, but that =
level might be 1/2, and then there would be no reliable way to get the rest=
 of the fuel out.  How do high-planes get by with it?  They run each line s=
eparately down to a common sump at the bottom of the plane.  The difference=
 in pressure would have to be larger than the head of fuel from top to bott=
om, about 4 feet or more.  In a low wing plane there is no vertical height
 available.  If you had a "three-way" valve that could select R-L-H-off it =
could work, I suppose.=0AGary Casey=0A=0A=0A=0A____________________________=
____=0A=0A=0AI want to run this idea I have past the group.=0A=0AMy current=
 set-up is 1/4" lines coming from my wing tanks to the my header.  Then a 3=
/8" line feeds my engine.  In this configuration I can only feed the engine=
 from Header only. This is the stock Lancair 320 fuel system.=0A=0AI would =
like to be able to run my engine off my wing tanks if needed but I don't wa=
nt to re-plumb the wings with 3/8" lines.  Can I connect the 1/4" wing tank=
 lines into a "T" with a 3/8" exit and run the line to the selector valve? =
 Essentially the wings would not be able to be selected but they would feed=
 at the same time equally. =0AWould this idea work?  And if so what type of=
 Andair valve would I need?  One with just a Left/Right/OFF  And I would ha=
ve them custom engrave the bezel to read Wings/Header/OFF=0A=0AThanks=0ABry=
an=0A=0A=0A=0A      
--0-122094960-1237638825=:78811
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></he=
ad><body><div style=3D"font-family:'times new roman', 'new york', times, se=
rif;font-size:12pt"><div>Bryan,</div><div>I'm afraid the setup you mention =
would be troublesome. =A0I don't know if a 1/4 line is adequate or not, so =
I'll pass on that. =A0Generally it is undesirable to connect both tanks tog=
ether in a low-wing plane, and this might be especially true of one with lo=
w dihedral. =A0The problem is that even a small difference in fuel level co=
uld result, as the fuel level gets low, in one tank unporting, allowing air=
 to enter the system. =A0As soon as air gets in the other tank will likely =
stop feeding entirely, shutting off the fuel supply.=A0=A0You could probabl=
y feed off both down to some level, but that level might be 1/2, and then t=
here would be no reliable way to get the rest of the fuel out.=A0=A0How do =
high-planes get by with it? =A0They run each line separately down to a comm=
on
 sump at the bottom of the plane. =A0The difference in pressure would have =
to be larger than the head of fuel from top to bottom, about 4 feet or more=
.. =A0In a low wing plane there is no vertical height available. =A0If you h=
ad a "three-way" valve that could select R-L-H-off it could work, I suppose=
..</div><div>Gary Casey</div><div style=3D"font-family:times new roman, new =
york, times, serif;font-size:12pt"><br><div style=3D"font-family:times new =
roman, new york, times, serif;font-size:12pt"><font size=3D"2" face=3D"Taho=
ma"><hr size=3D"1"></font><br><br>I want to run this idea I have past the g=
roup.<div><br></div><div>My current set-up is 1/4" lines coming from my win=
g tanks to the my header. =A0Then a 3/8" line feeds my engine. =A0In this c=
onfiguration I can only feed the engine from Header only. This is the stock=
 Lancair 320 fuel system.</div>=0A<div><br></div><div>I would like to be ab=
le to run my engine off my wing tanks if needed but I don't want to re-plum=
b the wings with 3/8" lines. =A0Can I connect the 1/4" wing tank lines into=
 a "T" with a 3/8" exit and run the line to the selector valve? =A0Essentia=
lly the wings would not be able to be selected but they would feed at the s=
ame time equally.=A0</div>=0A<div>Would this idea work? =A0And if so what t=
ype of Andair valve would I need? =A0One with just a Left/Right/OFF =A0And =
I would have them custom engrave the bezel to read Wings/Header/OFF</div><d=
iv><br></div><div>Thanks</div><div>=0ABryan</div>=0A<br></div></div><div st=
yle=3D"position:fixed"></div></div><br>=0A=0A      </body></html>
--0-122094960-1237638825=:78811--