X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.224] (HELO priv-edtnes40.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 967600 for flyrotary@lancaironline.net; Sun, 29 May 2005 21:08:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.224; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.127.73]) by priv-edtnes40.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with ESMTP id <20050530010725.XTJA24124.priv-edtnes40.telusplanet.net@boucher-oddle24> for ; Sun, 29 May 2005 19:07:25 -0600 Received: from 127.0.0.1 (AVG SMTP 7.0.322 [267.2.0]); Sun, 29 May 2005 18:07:21 -0700 Message-Id: <429A6746.000019.02592@BOUCHER-ODDLE24> Date: Sun, 29 May 2005 18:07:18 -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 was Re: Fuel Tank Selection X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-429A67497337=======" --=======AVGMAIL-429A67497337======= Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_643AENY1VA4000000000" --------------Boundary-00=_643AENY1VA4000000000 Content-Type: Text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Group FWIW=0D Call it a sump or header tank, if its large enough say 3 liters oops! I m= ean quarts with both pumps picking up fuel at the bottom 1/4 of the tank with the fuel return pointing at the cover to avoid aerating the fuel in the header (possibly a baffle below it & a vent pipe to each tank) Gravity fe= ed would work in a high wing , in a low wing I think you still need a low pressure transfer pump to push fuel to the header tank from the mains. I don't think it is safe to have "Both" position in the fuel selector excep= t in a gravity system with carburetors, not with EFI, the possibility of=20 sucking air "is unavoidable without check valves ( more weight, more cost= & more possibility of problems).=0D Georges B. ( Not really stirring the pot, maybe just a little)=0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 05/29/05 17:42:01=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: will EFI pumps pump air was Re: Fuel Tank Select= ion=0D =0D Now I'm not so worried, because each high pressure fuel=0D pump draws from it's own tank and the only point of inter- connection is where the lines join at the fuel rail(s).=0D =0D This brings up a question that I've had before, and I'm not sure this is exactly what anyone is doing, so it's not meant that way.=0D =0D Say you have two tanks, with an EFI pump for each tank. You then connec= t the output of each pump together, feeding into one line running to the fu= el rail. The question is: What happens when one tank runs out of gas? Wi= ll the EFI pump move enough air through it to disturb the fuel rail pressure that's being delivered from the other pump, or would it just stop pumping= at that point, and do no harm (other than maybe burning the pump up eventually)? =0D =0D Yep, still trying to figure out how to fix my fuel transfer system. =0D =0D Cheers,=0D Rusty=0D =0D =0D =20 --------------Boundary-00=_643AENY1VA4000000000 Content-Type: Text/HTML; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Group FWIW
Call it a sump or header tank, if its large enough say 3 liters oops= ! I mean quarts with both pumps picking up fuel at the bottom 1/4 of= the tank with the fuel return pointing at the cover to avoid aerating th= e fuel in the header (possibly a baffle below it & a vent pipe to eac= h tank) Gravity feed would work in a high wing , in a low wing I think yo= u still need a low pressure transfer pump to  push fuel to the heade= r tank from the mains. I don't think it is safe to have "Both" position i= n the fuel selector except in a gravity system with carburetors, not with=  EFI, the possibility of "sucking air "is unavoidable without check = valves ( more weight, more cost & more possibility of problems).
Georges B. ( Not really stirring the pot, maybe just a little)
 
-------Original Message-------
 
Date: 05/29/05 17:= 42:01
Subject: [FlyRotar= y] Re: will EFI pumps pump air was Re: Fuel Tank Selection
 

   Now I'm not so worried, because each high = pressure fuel
pump draws from it's own tank and the only point of inte= r- connection is where the lines join at the fuel rail(s).

 
This brin= gs up a question that I've had before, and I'm not sure this is exactly w= hat anyone is doing, so it's not meant that way.
 
Say you&n= bsp;have two tanks, with an EFI pump for each tank.   You = then connect the output of each pump together, feeding into one line runn= ing to the fuel rail.   The question is:  What happen= s when one tank runs out of gas?  Will the EFI pump move enough air = through it to disturb the fuel rail pressure that's being delivered from = the other pump, or would it just stop pumping at that point, and do no ha= rm (other than maybe burning the pump up eventually)? 
 
Yep, still trying to figure out h= ow to fix my fuel transfer system.
 
Cheers,
Rusty
 
 
 
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