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One final thought.....my aluminum sump tank in not
vented. Seems we discussed this at length when I was building this thing, and
since the overflow is pumped into the sump tank, the fuel might just be pumped
right out of the vent.
Paul,
this sounds a LOT like a problem I've experienced.
My
returns go to the main tanks switched by a solenoid. I used to be able to
create a crossfeed situation where I was drawing from one tank, but
returning to the other. The tank receiving the return became full, and I lost
power down to 2500 rpm or so. I was in the pattern when this occurred, so I just
brought it home. I had fuel coming out of the vent. I've seen this twice when
trying to feed the return to a full tank. Maybe the fuel pressure drops under
these circumstances.
In my
case I've rewired the switches to avoid crossfeed and added a crossfeed
warning light.
Regards,
John
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