Dan -

Have they set up the fuel injection system according to the SID97-3D (Fuel Injection System) that Continental publishes? They have charts for altitude and temperature compensation, as well as the correct tools and hookups. This should be done at each annual and before the first flight. On our ES, we mounted the fuel pressure transducer on the firewall, next to the oil pressure transducer. No problems with flying into and out of Ely, NV this past month ( Pattern was 7100 ft.).

Hope this helps,

John


On Mon, 23 Nov 2009 12:08:03 -0500, Dan Ballin <dballin@gmail.com> wrote:

A few questions have come up regarding fuel pressure while flight testing
Ralph Love's Legacy, N122PT.  It has an IO-550 with MT prop.  We've had
indications of high fuel pressure when the throttle is retarded (38-40 psi)
in the pattern which is accompanied by engine roughness.  All gets better
when the mixture is leaned.  Testing has been done in Redmond - so patterns
about 4-5000 ft.  So is this "normal" and just explained by the overly rich
state due to altitude and leaning is the solution or is something else going
on?  Where should the fuel pressure be measured from?  The unmetered side of
the fuel metering unit or the metered side?  and why.    And lastly, where
have you mounted the fuel pressure transducer?  EI suggests the firewall,
but that leads to a long fuel line and ? does that make any difference in
the readings, dampening etc.  Can you mount it closer or are the vibrations
going to cause failure of the fitting and fuel leaking over hot cylinders?

Any thoughts or comments will be appreciated.

Thanks

Dan Ballin
LEG2 #286

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