X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta05.westchester.pa.mail.comcast.net ([76.96.62.48] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4667132 for flyrotary@lancaironline.net; Fri, 07 Jan 2011 09:48:35 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.48; envelope-from=wschertz@comcast.net Received: from omta07.westchester.pa.mail.comcast.net ([76.96.62.59]) by qmta05.westchester.pa.mail.comcast.net with comcast id scgj1f0011GhbT855enzx9; Fri, 07 Jan 2011 14:47:59 +0000 Received: from WschertzPC ([71.57.77.95]) by omta07.westchester.pa.mail.comcast.net with comcast id seny1f00723NHuF3Tenyqj; Fri, 07 Jan 2011 14:47:59 +0000 Message-ID: <3A9BD3ED853C42C6AE48D2C01BD40A01@WschertzPC> From: "Bill Schertz" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: NOTICE !!!! Engine run-on with fuel pumps off! Date: Fri, 7 Jan 2011 08:47:55 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0034_01CBAE47.93ED3AE0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3502.922 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3502.922 This is a multi-part message in MIME format. ------=_NextPart_000_0034_01CBAE47.93ED3AE0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable If your fuel filters are located after the high pressure pumps, and are = oriented horizontally, then there is a place for air to reside, and act = as a =E2=80=98spring=E2=80=99 when the fuel pumps are turned off, = resulting in a short run-on. Whenever I remove the gascolator bowl to = check the screen for contamination, I end up introducing some air into = the system, that gets trapped in the fuel filter case, causing run-on. I = get the run on until that air gets gradually purged by fuel circulation. Bill Schertz KIS Cruiser #4045 N343BS Phase I testing From: Tracy=20 Sent: Friday, January 07, 2011 8:28 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: NOTICE !!!! Engine run-on with fuel pumps off! A lot of rubber hose in the fuel system will store a bit of pressure = after pumps off. Doesn't take much (or any) pressure depending on how = rich you are running at idle. Remember, at idle the engine is sucking = pretty hard on the injector. =20 Tracy On Fri, Jan 7, 2011 at 9:09 AM, David Leonard = wrote: Isn't your tank vented? Shouldn't be able to pressurize it. Maybe = you pressurized the fuel line with some air? --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net On Thu, Jan 6, 2011 at 7:32 PM, wrote: Long story short, standard eng. shut-down, main fuel pump switch = to OFF, half second or less, eng. quits rather quickly. = """UNLESS""" you are low on fuel,,, & picked up some air in the = lines,,, eng. remained running,,, after shaking the thoughts of = gremlins out of my head, possible as long as 20-30 seconds & quick look = at fuel gauge for tank I was on the thought came to me that I picked up = air from empty tank & pressurized it with fuel pump, I now have an air = pressure-fuel pump backup sys. so eng. will remain running, had to shut = down elect. to stop eng. How about that one to start the year. David = R. Cook RV6A Rotary. ------=_NextPart_000_0034_01CBAE47.93ED3AE0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
If your fuel filters are located after the high pressure pumps, and = are=20 oriented horizontally, then there is a place for air to reside, and act = as a=20 =E2=80=98spring=E2=80=99 when the fuel pumps are turned off, resulting = in a short run-on.=20 Whenever I remove the gascolator bowl to check the screen for = contamination, I=20 end up introducing some air into the system, that gets trapped in the = fuel=20 filter case, causing run-on. I get the run on until that air gets = gradually=20 purged by fuel circulation.
 
Bill=20 Schertz
KIS Cruiser #4045
N343BS
Phase I testing
 
From: Tracy
Sent: Friday, January 07, 2011 8:28 AM
Subject: [FlyRotary] Re: NOTICE !!!! Engine run-on with fuel = pumps=20 off!
 
A=20 lot of rubber hose in the fuel system will store a bit of pressure after = pumps=20 off.   Doesn't take much (or any) pressure depending on how = rich you=20 are running at idle.  Remember, at idle the engine is sucking = pretty hard=20 on the injector.  

Tracy

On Fri, Jan 7, 2011 at 9:09 AM, David Leonard = <wdleonard@gmail.com> = wrote:
Isn't your tank vented?  Shouldn't be able to=20 pressurize it.  Maybe you pressurized the fuel line with some=20 air?

--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

On Thu, Jan 6, 2011 at 7:32 PM, <hoursaway1@comcast.net> wrote:

Long story short,  standard eng. shut-down,  main fuel = pump=20 switch to OFF,  half second or less,  eng. quits rather=20 quickly.    """UNLESS"""   you are low on = fuel,,,=20 & picked up some air in the lines,,,  eng. remained=20 running,,,  after shaking the thoughts of gremlins out of my=20 head,  possible as long as 20-30 seconds & quick look at = fuel gauge=20 for tank I was on the thought came to me that I picked up air from = empty=20 tank & pressurized it with fuel pump, I now have an air = pressure-fuel=20 pump backup sys. so eng. will remain running, had to shut down = elect. to=20 stop eng.  How about that one to start the year.   = David R.=20 Cook  RV6A Rotary.



 
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