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AirMike
Joined: 27 Feb 2007
Posts: 514
Location: Nevada
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 Posted: Sun Oct 03, 2010 7:42 pm Post subject: Messy inboard fuel vent |
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This is a sort of follow up to the 1/29/08 discussion on fuel vents and fuel vent icing. I seem to be getting a fair amount of leaking (overflow) from my fuel vent especially on the pilot side. I have the standard Vans installation of the vent with a 90 degree downturn - plus I drilled a very small #50 hole in the top of the aluminum line (per 1/29/08 discussion) so
that my tank would not collapse if the vent iced up. Does anyone think that it would help the leak-out if I elevated the bend where the 90 degree turn is at the wing root. Are there other ramifications to doing this?
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See you OSH '18
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jesse(at)saintaviation.co
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| Posted: Mon Oct 04, 2010 1:54 am Post subject: Messy inboard fuel vent |
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The problem is probably that the outboard end of that line is not as high in the tank as it should be. I have fixed this situation before by reaching in with my finger through the fuel filler neck and bending the outboard end of the vent line towards the top skin of the tank. That line just needs to be open to the tank, so the higher it is in the tank, the more fuel you can have in the tank before it leaks out. I don't remember the plans making a big deal about the actual end of the line, but the closer it is to the outboard rib and the closer it is to the top skin, the more fuel you will be able to fit into the tank without it leaking.
Putting a bend in the inboard vent line will probably not do anything, because that would still be much lower than the level of fuel at the open end of the vent line in the tank. Putting a bend may hold a little bit of fuel in the line instead of it leaking out, but I don't see any benefit in that.
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694
On Oct 3, 2010, at 11:42 PM, AirMike wrote:
| Quote: |
This is a sort of follow up to the 1/29/08 discussion on fuel vents and fuel vent icing. I seem to be getting a fair amount of leaking (overflow) from my fuel vent especially on the pilot side. I have the standard Vans installation of the vent with a 90 degree downturn - plus I drilled a very small #50 hole in the top of the aluminum line (per 1/29/08 discussion) so
that my tank would not collapse if the vent iced up. Does anyone think that it would help the leak-out if I elevated the bend where the 90 degree turn is at the wing root. Are there other ramifications to doing this?
--------
OSH '10 or Bust
Q/B - finally done
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