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Date: Tue, 01 Dec 2009 06:31:04 -0500
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From: Burr Bryan <bjburr@mwheli.com>
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Subject: Re: [LML] Re: Fuel Pressure
References: <list-3994082@logan.com>

Thanks for your comments Paul.  That is why I thought it important to  
mention that the fuel flow remained normal and unchanged.  If the fuel  
flow changed up or down with the increase in pressure I would  
certainly be looking at a true mechanical problem.  Especially with an  
increase in pressure and a reduction in flow.  This would indicate at  
restriction.  But I certainly will be looking at everything.

Bryan
On Nov 28, 2009, at 3:31 PM, Paul Bricker wrote:

> Bryan,
> If you really have excessively high fuel pressure (not a bad sender)  
> the
> fuel flow can go high enough to cause a major power loss. One known  
> failure
> mode is in the aneroid in the fuel pump. It is designed to maintain  
> proper
> pressure as the outside pressure goes down with altitude. It can  
> fail to
> maximum possible pressure, causing excessive fuel flow, power loss,  
> black
> smoke, etc. During take-off this can be a critical failure. Always  
> monitor
> fuel flow, and, if you have to, control it manually using the mixture
> control until you can land and fix it.
> Paul Bricker
> N63PB
>
> -----Original Message-----
> From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf  
> Of Burr
> Bryan
> Sent: Saturday, November 28, 2009 9:55 AM
> To: lml
> Subject: [LML] Fuel Pressure
>
> Gents,
> Regarding a Continental TSIO550E, climb power 34.5" RPM2500, Full rich
> 33 gph.
> During a recent flight I experienced higher than normal fuel
> pressure.  The fuel flow was unchanged 33 gph as were the egt and cht
> temps.  Normally my fuel pressure is 36 psi but it climbed to 40 psi
> and the Chelton audible warning to "check engine" came on.  It is set
> to come on at 39.
>
> Typically I would be suspicious of high pressure if fuel flow had
> dropped as this could indicate a restriction.  But everything else
> remained normal.  Low pressure could indicate several things such as
> broken line, failing pump, restriction, etc.
>
> So what are the concerns with high fuel pressure?  What are the
> trouble shooting steps?  I suspect a possible wiring or sending unit
> issue?
>
> Thanks
> Bryan Burr
> N132BB
>
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