Paul,
It looks like the group has focused in on
the fuel system, or more specifically the sump tank as the likely culprit. I
suspected you might have been running mogas. Its my understanding that
auto fuel has a much lower vapor pressure than avgas and is therefore more
likely to vapor lock.
Just a SWAG, but I think the engine and
related systems got hot enough to heat the fuel in the fuel rails so that once
it passed the pressure regulator (pressure drop) it started to boil, similar to
when you open a hot soda. With the return fuel going to an unvented tank,
the boiling fuel expanded enough to cause pressure in the header tank so as to
prevent fresh fuel from flowing into the tank. Eventually, the header
tank ran dry and the engine quit. You sure handled the situation like a
pro. Hope I never have to face that scenario.
Mark S.
Hi, Mark...my humblest appologies for taking so long to
respond. I am whittling down the 200 plus messages in my inbox. I
was using auto fuel (regular). I have a fuel return line and it goes to the top
of my aluminum sump tank that is located on the cool side of the firewall
(inside the cabin, behind the rear seat). The return line is -8 in size.
Hope this helps. Paul Conner