X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 16 May 2011 09:39:05 -0400 Message-ID: X-Original-Return-Path: Received: from s6.cableone.net ([24.116.0.232] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4985022 for lml@lancaironline.net; Mon, 16 May 2011 07:01:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.116.0.232; envelope-from=bbreen@cableone.net Received: from [192.168.1.104] (unverified [96.19.144.204]) by s6.cableone.net (CableOne SMTP Service s6) with ESMTP id 42066669-1872270 for ; Mon, 16 May 2011 04:01:21 -0700 X-Original-Return-Path: Subject: Re: [LML] Re: Fuel restriction or air? References: From: Berni Content-Type: multipart/alternative; boundary=Apple-Mail-17-818967885 X-Mailer: iPad Mail (8H7) In-Reply-To: X-Original-Message-Id: <657FA84D-C44E-46FD-935E-AD3152A2589A@cableone.net> X-Original-Date: Mon, 16 May 2011 06:01:20 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8H7) X-Vpipe: Scanner said ok (av_avast) X-IP-stats: Incoming Last 3, First 2, in=1, out=0, spam=0 ip=96.19.144.204 X-Originating-IP: 96.19.144.204 X-Abuse-Info: Send abuse complaints to abuse@cableone.net --Apple-Mail-17-818967885 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii I have looked extensively and have found no water in the system. Sent from my iPad Berni Breen Bbreen@cableone.net On May 15, 2011, at 7:48 PM, Don Karich wrote: > Have you considered water contamination of fuel? >=20 > On Sun, May 15, 2011 at 5:04 AM, Berni wrote: > I have been trying to chase down the cause of a fuel issue in my normally a= spirated Lancair IV engine. During a cross country flight my fuel flow indi= cator began to show fluctuations which I mistakenly believed to be false rea= dings. Shortly thereafter during the same flight the engine began surging, s= lightly at first but increasingly worse in short time. So much so that I be= gan to plan for an emergency landing as I was looking to find the cause and t= o introduce a remedy. I turned on my electric (back up) fuel pump and the e= ngine immediately began to run strong and the fluctuation readings stabilize= d. >=20 > After gaining altitude I turned off the electric pump and the unstable fue= l flow readings as well as the engine surge returned. >=20 > My initial take was that my problem was caused by a failing engine driven f= uel pump. Even with that belief (once back on the ground) I checked as much= of the fuel system as possible looking for potential restrictions. I looke= d at and cleaned the screens at the wing root connections as well as the inl= et on the GAMI injectors. I found no restrictions so I removed and exchange= d my engine driven pump for a rebuilt unit. >=20 > After installing the rebuilt pump the engine tested fine on the ground and= fine in the air on a subsequent cross country trip. Approximately 2.1 hour= s of flying time later the exact same symptoms returned...erratic fuel flow r= eadings followed closely by engine surge. >=20 > I am now at a loss as to what I should now look for. Could my problem be d= ue to air somehow being introduced into my fuel flow? Should I be looking a= t my fuel selector as a possible culprit? If so how would I test that possi= bility? >=20 > Any and all suggestions would be most appreciated. >=20 > Sent from my iPad > Berni Breen > Bbreen@cableone.net > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l >=20 --Apple-Mail-17-818967885 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
I have looked extensively and have found no water in the system.

Sent from my iPad
Berni Breen

On May 15, 2011, at 7:48 PM, Don Karich <donkarich@gmail.com> wrote:

Have you considered water contamination of fuel?

On Sun, May 15, 2011 at 5:04 AM, Berni <bbreen@cableone.net> wrote:
I have been trying to chase down the cause of a fuel issue in my normally aspirated Lancair IV engine.  During a cross country flight my fuel flow indicator began to show fluctuations which I mistakenly believed to be false readings.  Shortly thereafter during the same flight the engine began surging, slightly at first but increasingly worse in short time.  So much so that I began to plan for an emergency landing as I was looking to find the cause and to introduce a remedy.  I turned on my electric (back up) fuel pump and the engine immediately began to run strong and the fluctuation readings stabilized.

After gaining altitude I turned off the electric pump and the unstable fuel flow readings as well as the engine surge returned.

My initial take was that my problem was caused by a failing engine driven fuel pump.  Even with that belief (once back on the ground) I checked as much of the fuel system as possible looking for potential restrictions.  I looked at and cleaned the screens at the wing root connections as well as the inlet on the GAMI injectors.  I found no restrictions so I removed and exchanged my engine driven pump for a rebuilt unit.

After installing the rebuilt pump the engine tested fine on the ground and fine in the air on a subsequent cross country trip.  Approximately 2.1 hours of flying time later the exact same symptoms returned...erratic fuel flow readings followed closely by engine surge.

I am now at a loss as to what I should now look for.  Could my problem be due to air somehow being introduced into my fuel flow?  Should I be looking at my fuel selector as a possible culprit?  If so how would I test that possibility?

Any and all suggestions would be most appreciated.

Sent from my iPad
Berni Breen
Bbreen@cableone.net
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