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Date: Tue, 6 Apr 1999 09:49:08 -0400
From: Lynda Frantz <LFrantz@compuserve.com>
Subject: 320/360 header tank vent lines
Sender: Lynda Frantz <LFrantz@compuserve.com>
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
>The manual recommends that the 1/4" AL lines which install into the header
tank for the site gauge, transfer lines, and vent line connection <

I've noted that several folks are using two transfer pumps to fill the
header tank with 1/4" feed lines from each pump.  I did the same.  As I
recall the standard configuration per the manual is one transfer pump.

With one pump the 1/4" header tank vent line is adequate but with two
pumps I would suggest that you use a 3/8" vent line.  If you were to
accidentally overfill the header tank, you don't want 11 gallons of
fuel in your lap because the 1/4" vent line couldn't handle the flow
from two pumps.

Jim Frantz
Lancair Network News


[There have been quite a few different plumbing versions presented to
us since I started this thread about a week ago... I'm hoping to gather
all the info into one place and create a fuel system link from the
LML homepage to show some of the different approaches.  Lloyd Dunlap's
system has the wing tanks teed together, and uses the fuel pumps in
series plumbed 'from' the right tank.  The other transfer line is setup
as a return line into the tee which joins the two mains with a check valve
that only allows fuel to flow back into the mains.  He has eliminated
the possibility of overfilling quite nicely.  Your point about
'overdriving' the vent line is well taken, Jim, thanks for passing that
 along.    <Marv>   ]

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LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html