X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.87] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 968016 for flyrotary@lancaironline.net; Mon, 30 May 2005 14:34:36 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.87; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 30 May 2005 11:33:49 -0700 Message-ID: Received: from 64.4.51.220 by BAY107-DAV15.phx.gbl with DAV; Mon, 30 May 2005 18:33:49 +0000 X-Originating-IP: [64.4.51.220] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: will EFI pumps pump air Date: Mon, 30 May 2005 14:33:45 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D1_01C56524.959D7700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 30 May 2005 14:33:45 -0400 X-OriginalArrivalTime: 30 May 2005 18:33:49.0628 (UTC) FILETIME=[1F3F37C0:01C56546] This is a multi-part message in MIME format. ------=_NextPart_000_00D1_01C56524.959D7700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageVery strange Rusty, it should work unless you have a very low = range Facet pump or have some restriction in return line. You *have* replicated my system because I also "T" the transfer pump = into the EFI return line to feed tank. It has no problem transferring = fuel with this arrangement. Facet makes these pumps in several = different pressure ranges. I think mine is the 4-6 psi model. I used = 3/8" line in this portion of system. Did you use something smaller? Tracy =20 Yep, still trying to figure out how to fix my fuel transfer system. =20 What's it look like now?=20 Remember the recent caution about copying a system 100%, or it becomes = a new system? Well, guilty as charged. My system 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 = regulator. That means the facet pump is trying to push against the = return flow from the regulator, and it's not doing too well. =20 Even at it's best, on the ground, with no other pumps on, the facet is = slow. In the air, fighting against one EFI pump's return flow, it takes = 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 = facet wasn't on because the check ball isn't perfect. I added a one way = valve to stop this, and to stop the fuel from leveling itself between = tanks when parked. =20 The obvious solution is to "simply" (NOT) add another hose to the 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. =20 Rusty ------=_NextPart_000_00D1_01C56524.959D7700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Very strange Rusty, it should work unless you have a very low range = Facet=20 pump or have some restriction in return line.
 
  You *have* replicated my system because I also "T" the = transfer pump=20 into the EFI return line to feed tank.   It has no problem=20 transferring fuel with this arrangement.  Facet makes these pumps = in=20 several different pressure ranges.  I think mine is the 4-6 = psi=20 model.   I used 3/8" line in this portion of = system.  Did=20 you use something smaller?
 
Tracy
 
Yep, still=20 trying to figure out how to fix my fuel transfer=20 system.   
 What's = it look like=20 now? 
 
 
Remember the recent caution about copying a = system=20 100%, or it becomes a new system?  Well, guilty as charged.  = My=20 system is just like Tracy's, except that I only have one return = line to=20 my feed tank.   I plumbed the wimpy facet transfer pump = into=20 the same line that returns from the regulator.  That means the = facet pump=20 is trying to push against the return flow from the regulator, and it's = not=20 doing too well. 
 
Even=20 at it's best, on the ground, with no other pumps on, the facet is = slow. =20 In the air, fighting against one EFI pump's return flow, it takes a = long long=20 time to see fuel moving.  With both EFI pumps on, I almost wonder = if fuel=20 isn't going backwards into the non-feed tank anytime the facet wasn't = on=20 because the check ball isn't perfect.  I added a one way = valve to=20 stop this, and to stop the fuel from leveling itself between tanks = when=20 parked.   
 
The=20 obvious solution is to "simply" (NOT) add another hose to = the feed=20 tank.  Even if I go through all that hassle, I'm still stuck with = the=20 slow rate of transfer of the facet.  It's probably still the = best=20 option, but I'm going to investigate every other option before doing=20 this. 
 
 Rusty =20
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