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Eugene -
You might be able to duplicate the situation per your hypothesis by injecting about a dropper full of water into the NACA duct end of the vent lines. I wouldn't take off with the water in there, but you might be able to detect a slowing of the fuel feed after you go thru your fuel management routine and ground runup. If it does not repeat, you may still be able to catch a negative pressure in the tanks by droppering a little water around the filler and seeing what happens when you slowly open the cap. If the pressure were high enough to suck the water into the tank, you could tell by trying to suck the water out of the trap with a syringe/baster. If none comes out, the hypothesis would weaken (?)
I don't believe our wingtip hose/vent line is in the same configuration ie. "p" trap shape.
Just some noodling on this one.
John
PS: On Sat, 12 May 2007 12:28:23 -0400, glong2 <glong2@netzero.net> wrote:
No I
have not drained the gas filter because I hoped to repeat the problem. Now
that I have a "high probability" solution I will sump the filter.
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