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Date: Tue, 31 Jul 2012 11:44:06 -0400
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Subject: Re: [LML] TSIO 550E Low Fuel Pressure: Adjust or Repair?
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From: "John Schroeder" <jgschroeder2@windstream.net>
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Isaac -

Continental recommends doing the SID 97-3XX every annual. We did did this  
on our IO-550N2 and had no problems in almost 500 hours. Doing the 97-3 is  
an iterative process and the idle mixture/rpm needs checking again after  
the full power check is done and anything was adjusted on that end. The  
parameters are also affected by temp and pressure altitude, so the tables  
in the SID need to be applied.

Hope this helps.

John


On Mon, 30 Jul 2012 13:52:02 -0400, Isaac Heizer <ijheizer@comcast.net>  
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


-- 
Cheers,

John

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yle>
<style type=3D"text/css">body { font-family:'Tahoma'; font-size:20px}</s=
tyle>
</head>
<body><div>Isaac -</div><div><br></div><div>Continental recommends doing=
 the SID 97-3XX every annual. We did did this on our IO-550N2 and had no=
 problems in almost 500 hours. Doing the 97-3 is an iterative process an=
d the idle mixture/rpm needs checking again after the full power check i=
s done and anything was adjusted on that end. The parameters are also af=
fected by temp and pressure altitude, so the tables in the SID need to b=
e applied.</div><div><br></div><div>Hope this helps.</div><div><br></div=
><div>John&nbsp;</div><div><br></div><div><br></div><div>On Mon, 30 Jul =
2012 13:52:02 -0400, Isaac Heizer &lt;ijheizer@comcast.net&gt; wrote:<br=
></div><br><blockquote style=3D"margin: 0 0 0.80ex; border-left: #0000FF=
 2px solid; padding-left: 1ex"><div style=3D"font-family: Arial; font-si=
ze: 12pt; color: #000000">My ES-P with a TSIO 550E, 660 hrs since new, n=
o longer reliably idles unless the electric fuel pump is running on low.=
&nbsp; This is =

new behavior in the past 10 hours or so.&nbsp; The engine is stock excep=
t for GAMIs and was originally set =

up to SID 97-3E but the fuel system hasn't been touched since then.&nbsp=
; =

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.&nbsp; But my question is&nbsp; "is the low idle pressure simply=
 normal =

wear and tear, or is something abnormal happening?"<br><br>I plotted the=
 minimum idle fuel pressure for the last 450 =

engine operating hours (MinimumIdleFuelPressure.jpg).&nbsp; Each marker =
is the minimum fuel pressure during a single flight
while the engine was idling at start of the flight.&nbsp; I defined idle=
 as engine running for at least 45 seconds, RPM =

between 700 and 1000 RPM, and oil temperature 120 degrees =

or cooler.&nbsp; It's clear to me the minimum idle pressure has been slo=
wly =

declining for the entire time, but it started a steeper drop about 100 =

hours ago.<br><br>I plotted the minimum fuel pressure during =

climb, when the boost pump was likely off (MinimumClimbFuelPressure.jpg)=
.&nbsp; Each marker is the minimum fuel =

pressure during a single flight.&nbsp; I considered data points where th=
e 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.&nbsp; I don't =
see =

anything weird about this plot, other than the minimum pressure has been=

 rising (?)<br><br>Neither my mechanic nor I really know the wear patter=
n =

for the mechanical fuel pump and related assemblies.&nbsp; I really want=
 to =

conclude that we can simply adjust the fuel pressure back to spec and ke=
ep =

flying.&nbsp; But there is so much expertise on this forum, I'm wonderin=
g if =

anybody has better advice.<br><br>Thanks<br>isaac heizer<br>N7842K</div>=
</blockquote><br><br><br><div id=3D"M2Signature"><div>-- </div><div><div=
><font color=3D"#008000">Cheers,</font></div><div><font color=3D"#008000=
"><br></font></div><div><font color=3D"#008000">John</font></div><div><b=
r></div><div>Using Opera's revolutionary email client: <a href=3D"http:/=
/www.opera.com/mail/">http://www.opera.com/mail/</a></div></div></div></=
body></html>
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