Berni,

 

I agree that it doesn't sound like a design problem if you've had a long history of good performance.  If you haven't changed anything and flown through several seasons of hot weather, you definitely have some component in the system that has degraded performance.  It could even be a combination of a couple very small things that have combined to create the problem.

 

At 1,000 hours you might be ready for some new hoses, replacing the gaskets and O rings in the gascolator, or checking out any components that might deteriorate after 1,000 hours.  I'm wondering if something like an exhaust leak or crack, baffle seal failure, blast tube leak, etc. could be causing a higher than historical cowl temperatures or fuel line temperatures.

 

Just using the low boost might just be masking the underlying problem, even though it will likely make your problem go away.  You'll still have some component of your fuel system that's not performing at 100%.

 

I've flown my ES without using my boost pump over 10,000 feet since the beginning.  But some other guys have had to use their low boost as standard operating procedure.  But if I suddenly needed the low boost, I'd suspect something is wrong.

 

Mike Easley

Colorado Springs

 

  R.     

Berni <bbreen@cableone.net> wrote:

>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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