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Date: Tue, 24 Nov 2009 06:20:32 -0500
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Subject: Re: [LML] Fuel Pressure question
From: "John Schroeder" <jschroeder@perigee.net>
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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