YS 91 ac

[William Clemons]

This is for the guys with YS 91 ac experience.  Have you ever had just a loss of pressure from the engine?  It will run fine for a minute and then dies.  I checked the fuel system for air leaks but cannot find any.  I even swapped needle valve assemblies thinking I might have a worn out one.  Any help is appreciated the engine has run fine up to this point.
Thanks in advance 
William
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