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Date: Thu, 02 Aug 2012 08:29:08 -0400
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Subject: Re: [LML] Re: TSIO 550E Low Fuel Pressure: Adjust or Repair?
From: "William A. Hogarty" <billhogarty@gmail.com>
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Isaac:

Your parameters look good, so I think that you are on the right track.
 Between 97-3E and the setup instructions in the manual, You should be
able to adjust your engine parameters.

Remember tho, when you adjust one of the engine parameters, you effect
 all the other parameters and the change is not linear.  Take your
time, make one small adjustment, then recheck all the other
parameters.

Good luck and please let us know your results,

Regards, Bill H.


On Wed, Aug 1, 2012 at 5:23 AM, Isaac Heizer <ijheizer@comcast.net> wrote:
> Thanks to everybody who took time to respond.  I've concluded it's normal
> wear and tear.  I've known I should be doing the SID 97-3E at each condition
> inspection, but somebody with the setup has been hard to come by.  I think
> I'll buy 3 good quality gauges (skip the $$ differential pressure gauge) and
> give it a go.  On the other hand, the G900X has accurate digital fuel
> pressure, MAP, and fuel flow gauges...so maybe I can just use the EFIS for
> the adjustments.  Comments?
>
> To further convince myself it's simple wear and tear, I plotted more
> parameters from the last 470ish operating hours (FlightData.jpg).  No sudden
> events, just the avg and max in-flight fuel pressures and flow have been
> trending downwards.
>
> thanks
> Isaac
> N7842K
>
> ________________________________
> From: "Isaac Heizer" <ijheizer@comcast.net>
> To: lml@lancaironline.net
> Sent: Monday, July 30, 2012 7:44:54 AM
> Subject: TSIO 550E Low Fuel Pressure: Adjust or Repair?
>
> 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
>
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