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Doug..
heat soak is a well known problem with aircraft fuel systems, especially fuel injected factory opposed piston engines.
When you shut the engine down, all cooling airflow stops. Heat remains. Everything under the cowl heat soaks before gradually cooling off. Fuel injection systems usually have fuel returns, so any excess pressure due to fuel vaporization in the rail is vented back to the fuel tank, so no dangerous overpressure results. The vaporization only occurs after shutdown, after cooling airflow ceases to a hot engine, as the fuel rail heat soaks due to conduction and radiation.
The technique I described a few posts ago has worked like a charm for me in Bonanzas, Mooneys and Arrows (all fuel injected engines in those particular models of airframe).
Dave
On 12/27/2010 3:50 PM, Doug Carter wrote:
Also remember that when you are starting the engine you are starting it under a load. This is different then in a car config where in a car you are starting it with no load attached to the crankshaft. If the fuel rails are getting so hot that they are vaporizing I would think this would cause an excess pressure in the fuel system and be very dangerous.
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