REFLECTOR: FUEL FEED

Brian Michalk michalk at awpi.com
Sat Feb 19 13:17:43 CST 2005


This is almost a dead horse, but I'm inclined to make a comment.  Nope, I'm
not flying, so don't have any experience.

What would happen if there were a fuel "trap" in one of the fuel vent lines.
The venting air would get sucked in to the tank, but if there's a low part
of the vent line holding fuel, then the air will have to bubble through,
like a tripple ripple on a fermenting carboy of beer.  Like a flushing
toilet, like a ...   Well,  you get the idea.

We know the fuel head pressure is low.  This "trap" would keep one tank at a
consistently lower pressure than the other tank, with a correlating
difference in fuel level.  Kinda similar to a leaky cap keeping one tank at
a lower pressure than the other.

Maybe the only way to "untrap" it would be after the fuel level has gone
down in the problem tank, crab the airplane so the fuel sloshes to the
outboard end of the tank.  Maybe the fuel "trap" could drain itself.
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