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**This again concurrs with my theory that the hot engine causes the fuel to vaporize in the higher (less gravity flow), slightly warmer (less air flow), and longer fuel line. **
The problem can happen on engines that do not have fuel problems in the system. (those should be eliminated as per the other suggestions in this thread.) The REAL problem is the engine-driven fuel pump. It gets heat-soaked and will vapor lock. The problem is indequate cooling to the fuel pump. There should be a cooling shroud and blast line to it. The cooling shroud is frequently inadequate. Also, as a matter of routine, I turn on the low boost at abotu 5000 feet and go to high aux boost at 10,000 feet in my airplane. This stops the problem, but is only a bandaid as fixing the cooling shroud is the real answer.
I have yet to see this addressed and not have it fix the problem.
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Walter Atkinson
Advanced Pilot Seminars
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