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Date: Wed, 16 Feb 2005 00:39:28 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Vapor Lock
References: <list-740930@logan.com>
In-Reply-To: <list-740930@logan.com>
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 Marvin Kaye wrote:

> Hi Paul,
>
> The system I described in my prior post was one that didn't include a 
> sump or header tank... fuel flow was direct from the wing tanks.  
> Component sequence was as follows:
> wing tanks > shutoff ball valves > fuel filters > HP fuel pumps > 
> secondary bypass circuits > fuel selector > fuel pressure transducer > 
> fluel flow transducers > firewall penetration > T to split flow to 
> fuel rails > fuel rails > FP regulator > return through fuel selector 
> to selected tank

I have a canard, but I will have a Facet pump near (and below) the wing 
tanks to PUSH the fuel through the filter and fuel flow transducer.  I 
don't want the HP pumps to SUCK through the filters and etc. for fear of 
vaporizing the fuel.

>
> The shutoff ball valves are hidden in the wing root fairings and allow 
> flow from the tanks to be disabled to make it possible to remove & 
> service the filters and pumps without having to drain the tanks.  
> Their handles are oriented so that they cannot be closed when their 
> access panels are installed.
>
> If your "sump" tank is truly a sump, I don't understand the need for 
> the Facet boost pump... the sump should be fed by gravity from the 
> mains.  If it needs to have fuel pumped up to it then it's a header.
>
>   <marv>
>
>
>
> "Paul" <sqpilot@bellsouth.net> wrote:
>
>  I'm a little confused...I have both.  I have a facet low pressure 
> boost pump
> between the fuel selector and sump tank, and two high pressure EFI 
> pumps after
> the sump tank, before the engine.  Paul Conner
>   ----- Original Message -----
>   From: WRJJRS@aol.com
>   To: Rotary motors in aircraft
>   Sent: Monday, February 14, 2005 2:15 PM
>   Subject: [FlyRotary] Re: Vapor Lock
>  
>  
>   In a message dated 2/13/2005 10:09:15 AM Pacific Standard Time,
> marv@lancaironline.net writes:
>  
>  
>     Other folks have reported fuel flow problems when they located 
> their pumps
>     between the engine and fuel selector instead of between the fuel 
> selector
> and
>     tanks... mostly the cause was air being sucked past the fuel 
> selector's
> seals
>     causing some air to be introduced into the fuel flow.
>  
>  
>   Good Point Marv,
>   Bill Jepson
>  
>  
>  ------------------------------------------------------------------------------ 
>
>  
>  
>   No virus found in this incoming message.
>   Checked by AVG Anti-Virus.
>   Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>
>
>

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&nbsp;Marvin Kaye wrote:<br>
<blockquote cite="midlist-740930@logan.com" type="cite">Hi Paul,
  <br>
  <br>
The system I described in my prior post was one that didn't include a
sump or header tank... fuel flow was direct from the wing tanks.&nbsp;
Component sequence was as follows:
  <br>
wing tanks &gt; shutoff ball valves &gt; fuel filters &gt; HP fuel
pumps &gt; secondary bypass circuits &gt; fuel selector &gt; fuel
pressure transducer &gt; fluel flow transducers &gt; firewall
penetration &gt; T to split flow to fuel rails &gt; fuel rails &gt; FP
regulator &gt; return through fuel selector to selected tank
  <br>
</blockquote>
<font color="#000099">I have a canard, but I will have a Facet pump
near (and below) the wing tanks to PUSH the fuel through the filter and
fuel flow transducer.&nbsp; I don't want the HP pumps to SUCK through the
filters and etc. for fear of vaporizing the fuel.</font><br>
<blockquote cite="midlist-740930@logan.com" type="cite"><br>
The shutoff ball valves are hidden in the wing root fairings and allow
flow from the tanks to be disabled to make it possible to remove &amp;
service the filters and pumps without having to drain the tanks.&nbsp; Their
handles are oriented so that they cannot be closed when their access
panels are installed.
  <br>
  <br>
If your "sump" tank is truly a sump, I don't understand the need for
the Facet boost pump... the sump should be fed by gravity from the
mains.&nbsp; If it needs to have fuel pumped up to it then it's a header.
  <br>
  <br>
&nbsp; &lt;marv&gt;
  <br>
  <br>
  <br>
  <br>
"Paul" <a class="moz-txt-link-rfc2396E" href="mailto:sqpilot@bellsouth.net">&lt;sqpilot@bellsouth.net&gt;</a> wrote:
  <br>
  <br>
&nbsp;I'm a little confused...I have both.&nbsp; I have a facet low pressure
boost pump
  <br>
between the fuel selector and sump tank, and two high pressure EFI
pumps after
  <br>
the sump tank, before the engine.&nbsp; Paul Conner
  <br>
&nbsp; ----- Original Message -----
  <br>
&nbsp; From: <a class="moz-txt-link-abbreviated" href="mailto:WRJJRS@aol.com">WRJJRS@aol.com</a>
  <br>
&nbsp; To: Rotary motors in aircraft
  <br>
&nbsp; Sent: Monday, February 14, 2005 2:15 PM
  <br>
&nbsp; Subject: [FlyRotary] Re: Vapor Lock
  <br>
&nbsp;
  <br>
&nbsp;
  <br>
&nbsp; In a message dated 2/13/2005 10:09:15 AM Pacific Standard Time,
  <br>
<a class="moz-txt-link-abbreviated" href="mailto:marv@lancaironline.net">marv@lancaironline.net</a> writes:
  <br>
&nbsp;
  <br>
&nbsp;
  <br>
&nbsp;&nbsp;&nbsp; Other folks have reported fuel flow problems when they located
their pumps
  <br>
&nbsp;&nbsp;&nbsp; between the engine and fuel selector instead of between the fuel
selector
  <br>
and
  <br>
&nbsp;&nbsp;&nbsp; tanks... mostly the cause was air being sucked past the fuel
selector's
  <br>
seals
  <br>
&nbsp;&nbsp;&nbsp; causing some air to be introduced into the fuel flow.
  <br>
&nbsp;
  <br>
&nbsp;
  <br>
&nbsp; Good Point Marv,
  <br>
&nbsp; Bill Jepson
  <br>
&nbsp;
  <br>
&nbsp;
  <br>
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&nbsp; Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005
  <br>
  <br>
  <blockquote type="cite">
    <blockquote type="cite">&nbsp;Homepage:&nbsp; <a class="moz-txt-link-freetext" href="http://www.flyrotary.com/">http://www.flyrotary.com/</a>
      <br>
&nbsp;Archive:&nbsp;&nbsp; <a class="moz-txt-link-freetext" href="http://lancaironline.net/lists/flyrotary/List.html">http://lancaironline.net/lists/flyrotary/List.html</a>
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