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Old Mar 07, 2013, 04:38 AM
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AA5BY's Avatar
East Texas
Joined Aug 2007
987 Posts
I have several 10oz tanks on 20cc gas planes and never have a problem. I think Dar has it right, that a felt klunk absorbs the vibrated fuel without the need to be immersed completely.
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Old Jun 17, 2014, 02:53 PM
Chuck it and see!
Wing-span's Avatar
UK, Cambridgeshire, Huntingdonshire
Joined Sep 2006
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Quote:
Originally Posted by earlwb View Post
Normally one does not use muffler pressure with a gasoline engine setup. I suggest using a three line setup for the fuel tank, one line is the fuel line, one line is for the vent and the third line is for refueling and defueling the fuel tank. I use a large loop or two for the vent line so that the fuel doesn't siphon out if the plane is inverted.

The gasoline engines use a pump carburetor so they do not need muffler pressure. You can pretty much place the fuel tank any place inside of the airplane as the pump in the carb draws the fuel for the engine and provides the fuel at a constant pressure via the fuel regulator to the engine.
I don't understand - How do loops in the vent stop the tank siphoning out when inverted?
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Old Jun 17, 2014, 03:12 PM
Chuck it and see!
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UK, Cambridgeshire, Huntingdonshire
Joined Sep 2006
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Ok Ok I asked that question before seeing those drawings. Alles klar!
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