Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 540738 for flyrotary@lancaironline.net; Sun, 21 Nov 2004 10:00:15 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041121145944.CFUK1976.imf20aec.mail.bellsouth.net@rd> for ; Sun, 21 Nov 2004 09:59:44 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] inflight fuel transfer (was Re: how do you carry, and measure oil?) Date: Sun, 21 Nov 2004 09:00:06 -0600 Message-ID: <015601c4cfda$c9e7fa60$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0157_01C4CFA8.7F4D8A60" 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 V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0157_01C4CFA8.7F4D8A60 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Turning on the fuel pump for a little while is probably also a great way = to mix any oil at the bottom of the tank. =20 Dave Leonard=20 =20 That works great for the right tank, but the left tank only transfers to = the right, and doesn't have a return. =20 =20 Speaking of fuel transfer, my system is like Tracy's, in that I feed = from only one tank, and use the other to transfer to the feed tank. The = transfer pump is a lowly Facet 5-6 psi pump. The feed tank has two high pressure = EFI pumps, and one AN-6 return line from the regulator. My transfer pump = Tees into the return line from the regulator. =20 =20 A while back, someone asked if the return from the regulator would = overpower the Facet pump, and keep fuel from being transferred to the feed tank. = The answer is that it can be a problem if you're running both EFI pumps. My normal flight mode is to run both EFI pumps at all times. I test them individually on pre-flight, and would turn one off if I lost an = alternator, but normally, they stay on. I found that this causes so much flow in = the return line that it does overpower the Facet pump. I bet I could leave = the Facet on all the time, and it MIGHT transfer enough to make up for what = I burn. In other words, the transfer is very slow. Turning off one of = the EFI pumps improves this considerably. If I were doing this over, I'd = have separate fittings for return fuel from the regulator, and for transfer = fuel from the non-feed tank. =20 =20 Cheers, Rusty (fresh out of comments) =20 ------=_NextPart_000_0157_01C4CFA8.7F4D8A60 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Turning on the fuel pump for a little while = is probably=20 also a great way to mix any oil at the bottom of the = tank.
 
Dave Leonard 
 
That works=20 great for the right tank, but the left tank only transfers to the right, = and=20 doesn't have = a return.  
 
Speaking of=20 fuel transfer, my system is like Tracy's, in that I feed from only one = tank, and=20 use the other to transfer to the feed tank.  The transfer pump = is a=20 lowly Facet 5-6 psi pump.  The feed tank has two high pressure EFI = pumps,=20 and one AN-6 return line from the regulator.  My transfer pump Tees = into=20 the return line from the regulator. =20
 
A while=20 back, someone asked if the return from the regulator would overpower the = Facet=20 pump, and keep fuel from being transferred to the feed tank.  The = answer is=20 that it can be a problem if you're running both EFI pumps.  My = normal=20 flight mode is to run both EFI pumps at all times.  I test = them=20 individually on pre-flight, and would turn one off if I lost an = alternator, but=20 normally, they stay on.  I found that this causes so much flow in = the=20 return line that it does overpower the Facet pump.  I bet I = could=20 leave the Facet on all the time, and it MIGHT transfer = enough to=20 make up for what I burn.   In other=20 words, the transfer is very slow.  Turning off one of the EFI pumps = improves this considerably.  If I were doing this over, I'd have = separate=20 fittings for return fuel from the regulator, and for transfer fuel from = the=20 non-feed tank. 
 
Cheers,
Rusty (fresh = out of=20 comments)
 
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