X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes51.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 967956 for flyrotary@lancaironline.net; Mon, 30 May 2005 13:01:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.26.27]) by priv-edtnes51.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with ESMTP id <20050530170058.OMRJ21892.priv-edtnes51.telusplanet.net@boucher-oddle24> for ; Mon, 30 May 2005 11:00:58 -0600 Received: from 127.0.0.1 (AVG SMTP 7.0.322 [267.3.0]); Mon, 30 May 2005 10:00:54 -0700 Message-Id: <429B46C2.000008.02524@BOUCHER-ODDLE24> Date: Mon, 30 May 2005 10:00:50 -0700 (Pacific Standard Time) X-Mailer: IncrediMail (3001609) From: "Echo Lake Fishing Resort (Georges Boucher)" References: To: Subject: Re: [FlyRotary] Re: will EFI pumps pump air X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-429B46C67689=======" --=======AVGMAIL-429B46C67689======= Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_E9BBRN00000000000000" --------------Boundary-00=_E9BBRN00000000000000 Content-Type: Text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi! Bob=0D Can't see a problem, but using a "Y" (return pointing to tank)instead of = a=20 T" would avoid turbulence causing bubbles. ( I have seen the difference i= n coolant by-passes in propane conversions, bubbled are formed with "T" & n= ot with "Y".=0D Georges B. =0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 05/30/05 09:52:09=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: will EFI pumps pump air=0D =0D I'm 'T'ing the output of the transfer pump into the supply line from=0D the main tank before the gascolator. The transfer pump will only have=0D to overcome the head of the fuel, about 3 feet or so to push fuel back=0D into the main tank. Is there anything I'm missing that would keep this=0D from working?=0D =0D Bob W.=0D =0D On Mon, 30 May 2005 10:51:53 -0500=0D "Russell Duffy" <13brv3@bellsouth.net> wrote:=0D =0D > Will the EFI pump move enough air through it to disturb the fuel rail=0D > pressure that's being delivered from the other pump,=0D > I would say yes=0D >=0D >=0D > I'd bet that you have a 50-50 chance of being right :-) Seriously, I'= m not=0D > so sure it would pump air well enough to overcome the 43 psi of pressur= e=0D > that the other pump is putting in the rail. I guess the only way to fi= nd=0D > out it to do the experiment. I'm not completely sure that's what I want= to=0D > do anyway.=0D >=0D > Yep, still trying to figure out how to fix my fuel transfer system.=0D > What's it look like now?=0D >=0D >=0D > Remember the recent caution about copying a system 100%, or it becomes = a new=0D > system? Well, guilty as charged. My system is just like Tracy's, exce= pt=0D > that I only have one return line to my feed tank. I plumbed the wimpy= =0D > facet transfer pump into the same line that returns from the regulator.= =0D > That means the facet pump is trying to push against the return flow fro= m the=0D > regulator, and it's not doing too well.=0D >=0D > Even at it's best, on the ground, with no other pumps on, the facet is slow.=0D > In the air, fighting against one EFI pump's return flow, it takes a lon= g=0D > long time to see fuel moving. With both EFI pumps on, I almost wonder = if=0D > fuel isn't going backwards into the non-feed tank anytime the facet was= n't=0D > on because the check ball isn't perfect. I added a one way valve to st= op=0D > this, and to stop the fuel from leveling itself between tanks when park= ed.=0D >=0D >=0D > The obvious solution is to "simply" (NOT) add another hose to the feed tank.=0D > Even if I go through all that hassle, I'm still stuck with the slow rat= e of=0D > transfer of the facet. It's probably still the best option, but I'm go= ing=0D > to investigate every other option before doing this.=0D >=0D > Rusty=0D >=0D =0D =0D --=0D http://www.bob-white.com=0D N93BD - Rotary Powered BD-4 (real soon)=0D =0D >> Homepage: http://www.flyrotary.com/=0D >> Archive: http://lancaironline.net/lists/flyrotary/List.html=0D =0D =0D --=0D No virus found in this incoming message.=0D Checked by AVG Anti-Virus.=0D Version: 7.0.322 / Virus Database: 267.3.0 - Release Date: 5/30/2005=0D =0D =2E --------------Boundary-00=_E9BBRN00000000000000 Content-Type: Text/HTML; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi! Bob
Can't see a problem, but using a "Y" (return pointing to tank)instea= d of a "T" would avoid turbulence causing bubbles. ( I have seen the diff= erence in coolant by-passes in propane conversions, bubbled are formed wi= th "T" & not with "Y".
Georges B. 
 
-------Original Message-------
 
Date: 05/30/05 09:= 52:09
Subject: [FlyRotar= y] Re: will EFI pumps pump air
 
I'm 'T'ing the output of the transfer pump into the supply line from=
the main tank before the gascolator.  The transfer pump wi= ll only have
to overcome the head of the fuel, about 3 feet or so to push fuel ba= ck
into the main tank.  Is there anything I'm missing that wo= uld keep this
from working?
 
Bob W.
 
On Mon, 30 May 2005 10:51:53 -0500
"Russell Duffy" <13brv3@b= ellsouth.net> wrote:
 
> Will the EFI pump move enough air through it to disturb the fue= l rail
> pressure that's being delivered from the other pump,
>  I would say yes
>
>
> I'd bet that you have a 50-50 chance of being right :-) &n= bsp; Seriously, I'm not
> so sure it would pump air well enough to overcome the 43 psi of= pressure
> that the other pump is putting in the rail.  I guess = the only way to find
> out it to do the experiment. I'm not completely sure that's wha= t I want to
> do anyway.
>
> Yep, still trying to figure out how to fix my fuel transfer sys= tem.
>  What's it look like now?
>
>
> Remember the recent caution about copying a system 100%, or it = becomes a new
> system?  Well, guilty as charged.  My syste= m is just like Tracy's, except
> that I only have one return line to my feed tank.   I= plumbed the wimpy
> facet transfer pump into the same line that returns from the re= gulator.
> That means the facet pump is trying to push against the return = flow from the
> regulator, and it's not doing too well.
>
> Even at it's best, on the ground, with no other pumps on, the f= acet is slow.
> In the air, fighting against one EFI pump's return flow, it tak= es a long
> long time to see fuel moving.  With both EFI pumps on= , I almost wonder if
> fuel isn't going backwards into the non-feed tank anytime the f= acet wasn't
> on because the check ball isn't perfect.  I added a o= ne way valve to stop
> this, and to stop the fuel from leveling itself between tanks w= hen parked.
>
>
> The obvious solution is to "simply" (NOT) add another hose to t= he feed tank.
> Even if I go through all that hassle, I'm still stuck with the = slow rate of
> transfer of the facet.  It's probably still the best = option, but I'm going
> to investigate every other option before doing this.
>
>  Rusty
>
 
 
--
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (real soon)
 
>>  Homepage:  http://www.flyrotary.com/
 
 
--
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.322 / Virus Database: 267.3.0 - Release Date: 5/30/2005=
 
.
--------------Boundary-00=_E9BBRN00000000000000-- --=======AVGMAIL-429B46C67689======= Content-Type: text/plain; x-avg=cert; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Content-Description: "AVG certification" No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.322 / Virus Database: 267.3.0 - Release Date: 5/30/2005 --=======AVGMAIL-429B46C67689=======--