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Subject: Re: [LML] Fuel restriction or air?
From: Don Karich <donkarich@gmail.com>
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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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
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>

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Have you considered water contamination of fuel?<br><br>
<div class=3D"gmail_quote">On Sun, May 15, 2011 at 5:04 AM, Berni <span dir=
=3D"ltr">&lt;<a href=3D"mailto:bbreen@cableone.net">bbreen@cableone.net</a>=
&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">I have been trying to chase down=
 the cause of a fuel issue in my normally aspirated Lancair IV engine. =A0D=
uring a cross country flight my fuel flow indicator began to show fluctuati=
ons which I mistakenly believed to be false readings. =A0Shortly thereafter=
 during the same flight the engine began surging, slightly at first but inc=
reasingly worse in short time. =A0So much so that I began to plan for an em=
ergency landing as I was looking to find the cause and to introduce a remed=
y. =A0I turned on my electric (back up) fuel pump and the engine immediatel=
y began to run strong and the fluctuation readings stabilized.<br>
<br>After gaining altitude I turned off the electric pump and the unstable =
fuel flow readings as well as the engine surge returned.<br><br>My initial =
take was that my problem was caused by a failing engine driven fuel pump. =
=A0Even with that belief (once back on the ground) I checked as much of the=
 fuel system as possible looking for potential restrictions. =A0I looked at=
 and cleaned the screens at the wing root connections as well as the inlet =
on the GAMI injectors. =A0I found no restrictions so I removed and exchange=
d my engine driven pump for a rebuilt unit.<br>
<br>After installing the rebuilt pump the engine tested fine on the ground =
and fine in the air on a subsequent cross country trip. =A0Approximately 2.=
1 hours of flying time later the exact same symptoms returned...erratic fue=
l flow readings followed closely by engine surge.<br>
<br>I am now at a loss as to what I should now look for. =A0Could my proble=
m be due to air somehow being introduced into my fuel flow? =A0Should I be =
looking at my fuel selector as a possible culprit? =A0If so how would I tes=
t that possibility?<br>
<br>Any and all suggestions would be most appreciated.<br><br>Sent from my =
iPad<br>Berni Breen<br><a href=3D"mailto:Bbreen@cableone.net">Bbreen@cableo=
ne.net</a><br><font color=3D"#888888">--<br>For archives and unsub <a href=
=3D"http://mail.lancaironline.net:81/lists/lml/List.html" target=3D"_blank"=
>http://mail.lancaironline.net:81/lists/lml/List.html</a><br>
</font></blockquote></div><br>

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