jpspencer(at)cableone.net
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 Posted: Mon Mar 03, 2008 7:16 am Post subject: Fuel Caps leaking |
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John
Right. Your description is just about exactly what I did on the vent tube and of course after really looking at the cap it's obvious that fuel is getting around the portion of the vent tube that extends inside the fuel cap as well as thru the existing small holes. Will epoxy all that up or maybe braze and believe that will do it.
Guys thanks for the replies.
Joe
Of course that vent tube brazed to the top of the cap needs to go
through the inner portion of the cap as well, then the original holes in
that inner layer are plugged.
Those caps with that original venting system are only suitable for a
filler neck that's well above the fuel level, like in a car gas tank.
If the fuel sloshes up against the cap, like it will do in a full
aircraft tank, they will leak.
The new vent tube only needs to be 1/8" bore, and three inches high is
enough to prevent fuel sloshing up and out. Bent so it's facing forward
pressurizes it very slightly and prevents it from sucking fuel out.
Bend it so that the very front is a bit down and then rain doesn't get
in. There's no airflow as such into the tube, just enough to replace
fuel volume used and release fuel vapour pressure.
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