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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