X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 27 Jan 2013 20:41:42 -0500 Message-ID: X-Original-Return-Path: Received: from imr-mb02.mx.aol.com ([64.12.207.163] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6031954 for lml@lancaironline.net; Sun, 27 Jan 2013 14:30:52 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.207.163; envelope-from=peterpaw@aol.com Received: from mtaomg-mb03.r1000.mx.aol.com (mtaomg-mb03.r1000.mx.aol.com [172.29.41.74]) by imr-mb02.mx.aol.com (Outbound Mail Relay) with ESMTP id EE1DD380000F8 for ; Sun, 27 Jan 2013 14:30:19 -0500 (EST) Received: from core-mma004b.r1000.mail.aol.com (core-mma004.r1000.mail.aol.com [172.29.191.141]) by mtaomg-mb03.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id C3C85E00008B for ; Sun, 27 Jan 2013 14:30:19 -0500 (EST) References: X-Original-To: lml@lancaironline.net Subject: Re: [LML] Question about Dukes Fuel Pumps In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: peter williams X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CFCADBE06068DC_1708_84BFA_webmail-m001.sysops.aol.com" X-Mailer: AOL Webmail 37309-STANDARD Received: from 69.204.230.119 by webmail-m001.sysops.aol.com (64.12.101.83) with HTTP (WebMailUI); Sun, 27 Jan 2013 14:30:19 -0500 X-Original-Message-Id: <8CFCADBE056E35C-1708-27AE4@webmail-m001.sysops.aol.com> X-Originating-IP: [69.204.230.119] X-Original-Date: Sun, 27 Jan 2013 14:30:19 -0500 (EST) x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:480585760:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d294a5105804b5cf6 This is a multi-part message in MIME format. ----------MB_8CFCADBE06068DC_1708_84BFA_webmail-m001.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" hi there my 4P has a high-off-low three position switch, just for what you describe peter =20 =20 =20 -----Original Message----- From: George Wehrung To: lml Sent: Sun, Jan 27, 2013 1:30 pm Subject: [LML] Question about Dukes Fuel Pumps All, A couple of questions about Dukes electric boost pumps. If the engine driv= en=20 fuel pump fails, can the Dukes electric boost pump, in the low flow mode su= pply=20 enough fuel to keep the IO-550 running, at what I would guess a lower power= =20 setting to find a place to land? I have noticed that some installations have both a prime button and have a= =20 separate high flow mode incorporated into a a HIGH-OFF-LOW rocker switch. = My=20 airplane only has a LOW-OFF selection for the boost pump in addition to the= push=20 to engage Prime mode, which I have learned is the High Flow mode for the bo= ost=20 pump. =20 It does not seem to make sense that if one lost the engine driven fuel pump= that=20 you would have to hold the prime button in order to have High Flow mode fro= m the=20 electric boost pump to keep the engine running. Or, should my airplane hav= e the=20 HIGH-OFF-LOW boost pump rocker switch installed? There doesn't seem to be any spec sheets available on the flow volume in th= e=20 High and Low modes of the Dukes Electric Boost pump. Lastly, from what I have learned in the build manual that there must be an= =20 internal bypass in the engine driven fuel pump if it fails? The plumbing s= eems=20 to be as follows: Fuel tank, fuel tank selector valve, electric boost pump,= =20 firewall, gascolator, engine driven boost pump, and then fuel distributor, = and=20 then injectors. I know there is a return line from the engine driven boost = pump=20 back to the fuel selector valve.=20 Thanks for the help George -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html =20 ----------MB_8CFCADBE06068DC_1708_84BFA_webmail-m001.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" hi there

my 4P has a high-off-low three position switch, just for what you describe<= br>
peter



-----= Original Message-----
From: George Wehrung <gw5@me.com>
To: lml <lml@lancaironline.net>
Sent: Sun, Jan 27, 2013 1:30 pm
Subject: [LML] Question about Dukes Fuel Pumps

All,

A couple of questions about Dukes electric boost pumps.  If the engine driv=
en=20
fuel pump fails, can the Dukes electric boost pump, in the low flow mode su=
pply=20
enough fuel to keep the IO-550 running, at what I would guess a lower power=
=20
setting to find a place to land?

I have noticed that some installations have both a prime button and have a=
=20
separate high flow mode incorporated into a a HIGH-OFF-LOW rocker switch.  =
My=20
airplane only has a LOW-OFF selection for the boost pump in addition to the=
 push=20
to engage Prime mode, which I have learned is the High Flow mode for the bo=
ost=20
pump. =20

It does not seem to make sense that if one lost the engine driven fuel pump=
 that=20
you would have to hold the prime button in order to have High Flow mode fro=
m the=20
electric boost pump to keep the engine running.  Or, should my airplane hav=
e the=20
HIGH-OFF-LOW boost pump rocker switch installed?

There doesn't seem to be any spec sheets available on the flow volume in th=
e=20
High and Low modes of the Dukes Electric Boost pump.

Lastly, from what I have learned in the build manual that there must be an=
=20
internal bypass in the engine driven fuel pump if it fails?  The plumbing s=
eems=20
to be as follows: Fuel tank, fuel tank selector valve, electric boost pump,=
=20
firewall, gascolator, engine driven boost pump, and then fuel distributor, =
and=20
then injectors. I know there is a return line from the engine driven boost =
pump=20
back to the fuel selector valve.=20

Thanks for the help

George





--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/L=
ist.html
----------MB_8CFCADBE06068DC_1708_84BFA_webmail-m001.sysops.aol.com--