That sounds interesting Graham;
My vent comes out of the tank, run horizontally to the bulkhead behind the
baggage
bay, then loops upwards over the top of the fuselage and down the other side
to vent through the underside. When filling, if I get the fuel level too close
to the filler cap, it starts a syphon through the vent that is hard to stop
until it's dumped a couple of litres of fuel. I've been trying to think of a
way to break the syphon.
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