X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 967598 for flyrotary@lancaironline.net; Sun, 29 May 2005 20:42:00 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=13brv3@bellsouth.net Received: from ibm69aec.bellsouth.net ([65.6.194.9]) by imf25aec.mail.bellsouth.net with ESMTP id <20050530004116.NLIO22513.imf25aec.mail.bellsouth.net@ibm69aec.bellsouth.net> for ; Sun, 29 May 2005 20:41:16 -0400 Received: from rd ([65.6.194.9]) by ibm69aec.bellsouth.net with ESMTP id <20050530004115.UFJT13045.ibm69aec.bellsouth.net@rd> for ; Sun, 29 May 2005 20:41:15 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] will EFI pumps pump air was Re: Fuel Tank Selection Date: Sun, 29 May 2005 19:41:29 -0500 Message-ID: <000501c564b0$538b58b0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C56486.6AB550B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C56486.6AB550B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Now I'm not so worried, because each high pressure fuel pump draws from it's own tank and the only point of inter- connection is where the lines join at the fuel rail(s). =20 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. =20 Say you have two tanks, with an EFI pump for each tank. You then = connect the output of each pump together, feeding into one line running to the = fuel rail. The question is: What happens 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 harm (other than maybe burning the pump up eventually)? =20 =20 Yep, still trying to figure out how to fix my fuel transfer system.=20 =20 Cheers, Rusty =20 =20 ------=_NextPart_000_0006_01C56486.6AB550B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

   Now I'm not so worried, because each high = pressure=20 fuel
pump draws from it's own tank and the only point of inter- = connection is=20 where the lines join at the fuel rail(s).

 
This = brings up a=20 question that I've had before, and I'm not sure this is exactly what = anyone is=20 doing, so it's not meant that way.
 
Say = you have two=20 tanks, with an EFI pump for each tank.   You then connect = the=20 output of each pump together, feeding into one line running to the fuel=20 rail.   The question is:  What happens when one tank = runs=20 out of gas?  Will the EFI pump move enough air through it to = disturb the=20 fuel rail pressure that's being delivered from the other pump, or would = it just=20 stop pumping at that point, and do no harm (other than maybe burning the = pump up=20 eventually)? 
 
Yep, still trying to figure out = how to fix=20 my fuel transfer system.
 
Cheers,
Rusty
 
 
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