I have received a few responses that point to heat as a potential culprit.  To date I have been reluctant to believe this is the cause as my airframe/engine/fuel systems have over 1000 hours of flight time with zero previous symptoms such as fuel pressure, fuel flow and engine surging.  Since I have come up with any other cause. I am going to look at this as a potential cause.

I will continue to update the list as I pursue a remedy.  In the meantime I welcome any and all suggestions.

Berni Breen
Sent from my iPhone

On May 25, 2011, at 6:41 AM, "Steve Colwell" <mcmess1919@yahoo.com> wrote:

> Berni,
>
> My first response to your problem was a quick copy and paste of my post when
> I was having the same symptoms. I hope it made sense. Consider the
> recommendations I quoted from Continental, Cirrus and Advanced Pilot
> Seminars to run the low boost pump above 10,000'. Temperature under the
> cowling, fuel temperature and density altitude are all factors.  If your
> firewall fuel line routing or temps are just a little higher than some other
> applications it could easily cause your problem.  My Legacy has 1/2" fuel
> line all the way to the Gascolator and a engine pump shroud (from Lancair)
> with a blast tube and I still had the problem.  Low Boost solved it for me.
>
>
> Steve Colwell  (recent Barrett engine running great)
>
>
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