X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 31 Jul 2012 11:44:06 -0400 Message-ID: X-Original-Return-Path: Received: from mail-lb0-f180.google.com ([209.85.217.180] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5684615 for lml@lancaironline.net; Mon, 30 Jul 2012 14:19:36 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.217.180; envelope-from=grabiel71@gmail.com Received: by lbbgj3 with SMTP id gj3so2875712lbb.25 for ; Mon, 30 Jul 2012 11:19:01 -0700 (PDT) MIME-Version: 1.0 Received: by 10.152.112.233 with SMTP id it9mr12162640lab.40.1343672341561; Mon, 30 Jul 2012 11:19:01 -0700 (PDT) Received: by 10.114.38.37 with HTTP; Mon, 30 Jul 2012 11:19:01 -0700 (PDT) Received: by 10.114.38.37 with HTTP; Mon, 30 Jul 2012 11:19:01 -0700 (PDT) In-Reply-To: References: X-Original-Date: Mon, 30 Jul 2012 14:19:01 -0400 X-Original-Message-ID: Subject: Re: [LML] TSIO 550E Low Fuel Pressure: Adjust or Repair? From: don Grabiel X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=f46d040838d39d004f04c61018d7 --f46d040838d39d004f04c61018d7 Content-Type: text/plain; charset=ISO-8859-1 Isaac, you've probably cleaned the injector nozzles? If not that would be a good place to start. Don G. On Jul 30, 2012 1:53 PM, "Isaac Heizer" wrote: > My ES-P with a TSIO 550E, 660 hrs since new, no longer reliably idles > unless the electric fuel pump is running on low. This is new behavior in > the past 10 hours or so. The engine is stock except for GAMIs and was > originally set up to SID 97-3E but the fuel system hasn't been touched > since then. It's apparent from the G900X's fuel pressure display that the > idle fuel pressure is too low, and we can most likely readjust the > pressures back to spec. But my question is "is the low idle pressure > simply normal wear and tear, or is something abnormal happening?" > > I plotted the minimum idle fuel pressure for the last 450 engine operating > hours (MinimumIdleFuelPressure.jpg). Each marker is the minimum fuel > pressure during a single flight while the engine was idling at start of the > flight. I defined idle as engine running for at least 45 seconds, RPM > between 700 and 1000 RPM, and oil temperature 120 degrees or cooler. It's > clear to me the minimum idle pressure has been slowly declining for the > entire time, but it started a steeper drop about 100 hours ago. > > I plotted the minimum fuel pressure during climb, when the boost pump was > likely off (MinimumClimbFuelPressure.jpg). Each marker is the minimum fuel > pressure during a single flight. I considered data points where the RPM > was between 2450 and 2550, MAP between 29 and 32, and altitude below 9000' > -- I think these are likely times when I had not activated the boost pump. > I don't see anything weird about this plot, other than the minimum pressure > has been rising (?) > > Neither my mechanic nor I really know the wear pattern for the mechanical > fuel pump and related assemblies. I really want to conclude that we can > simply adjust the fuel pressure back to spec and keep flying. But there is > so much expertise on this forum, I'm wondering if anybody has better advice. > > Thanks > isaac heizer > N7842K > > -- > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List.html > > --f46d040838d39d004f04c61018d7 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Isaac,=A0 you've probably cleaned the injector nozzles?=A0 If not th= at would be a good place to start. Don G.

On Jul 30, 2012 1:53 PM, "Isaac Heizer"= ; <ijheizer@comcast.net> = wrote:
My ES-P with a TSIO 55= 0E, 660 hrs since new, no longer reliably idles unless the electric fuel pu= mp is running on low.=A0 This is=20 new behavior in the past 10 hours or so.=A0 The engine is stock except for = GAMIs and was originally set=20 up to SID 97-3E but the fuel system hasn't been touched since then.=A0= =20 It's apparent from the G900X's fuel pressure display that the idle = fuel=20 pressure is too low, and we can most likely readjust the pressures back=20 to spec.=A0 But my question is=A0 "is the low idle pressure simply nor= mal=20 wear and tear, or is something abnormal happening?"

I plotted t= he minimum idle fuel pressure for the last 450=20 engine operating hours (MinimumIdleFuelPressure.jpg).=A0 Each marker is the= minimum fuel pressure during a single flight while the engine was idling at start of the flight.=A0 I defined idle as en= gine running for at least 45 seconds, RPM=20 between 700 and 1000 RPM, and oil temperature 120 degrees=20 or cooler.=A0 It's clear to me the minimum idle pressure has been slowl= y=20 declining for the entire time, but it started a steeper drop about 100=20 hours ago.

I plotted the minimum fuel pressure during=20 climb, when the boost pump was likely off (MinimumClimbFuelPressure.jpg).= =A0 Each marker is the minimum fuel=20 pressure during a single flight.=A0 I considered data points where the RPM = was between 2450 and=20 2550, MAP between 29 and 32, and altitude below 9000' -- I think these= =20 are likely times when I had not activated the boost pump.=A0 I don't se= e=20 anything weird about this plot, other than the minimum pressure has been rising (?)

Neither my mechanic nor I really know the wear pattern= =20 for the mechanical fuel pump and related assemblies.=A0 I really want to=20 conclude that we can simply adjust the fuel pressure back to spec and keep= =20 flying.=A0 But there is so much expertise on this forum, I'm wondering = if=20 anybody has better advice.

Thanks
isaac heizer
N7842K

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For archives and unsub http://mail.lancaironline.net:81/lists/lml/L= ist.html

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