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Nic(at)skyhi.flyer.co.uk
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 Posted: Sun Aug 06, 2006 8:42 am Post subject: More on fuel breather problems ... |
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Many thanks for the suggestions on the fuel breather problems on my RH tank.
here are the latest observations :
If I blow through the breather from the inlet under the fuselage, then air
reaches the far end of the breather in the upper corner of the tank.
If I fill the tank (below the tank breather level ) in hot weather fuel will
start to vent underneath the aircraft and come out in a constant stream that
appears as though it is siphoning, this will continue until a lot of fuel
has been lost and the tank has lost a considerable amount of fuel.
My concussion is that there maybe a leak in the breather on the inside of
the tank. Fuel leaks into the breather, and as the air in the tank expands
it forces the fuel out along the breather. Once pressurised the fuel starts
to flow, and then siphons until equilibrium is reached.
Problem - how do I fix the leak without removing the tank and messing up an
expensive paint job ? or am I barking up the wrong tree ? At nearly
$10/gal I would really like to fix this problem. Any suggestions
appreciated.
Rgds, Nic
PS - THIS IS A QB READY-BUILT VANS TANK
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kboatright1(at)comcast.ne
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| Posted: Sun Aug 06, 2006 9:18 am Post subject: More on fuel breather problems ... |
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A guess is that something has come loose where the vent line attaches to an
AN fitting inside the tank rib at the wing root. In an RV-6 tank, you can
access that fitting by removing the fuel tank access/sender plate at the
root end of the fuel tank.
Once you have access to the fitting, you can tighten it and maybe apply a
little proseal where it goes through the tank rib.
KB
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ssamps(at)gmail.com
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| Posted: Sun Aug 06, 2006 11:05 pm Post subject: More on fuel breather problems ... |
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Nic - I agree with Kyle. From what you describe my bet is the AN fitting where the vent line joins to the tank plate is not tight. I have heard of people getting the plate off without removing the tank or wing. That would give you an inch or so of access ....but it sounds like a bitch of a job.
If it is any help you can see how it should be arranged inside if you go here. The final of 3 pictures.
Good luck, Steve.
On 06/08/06, Kyle Boatright <kboatright1(at)comcast.net (kboatright1(at)comcast.net)> wrote: [quote]--> RV-List message posted by: "Kyle Boatright" < kboatright1(at)comcast.net (kboatright1(at)comcast.net)>
A guess is that something has come loose where the vent line attaches to an
AN fitting inside the tank rib at the wing root. In an RV-6 tank, you can
access that fitting by removing the fuel tank access/sender plate at the
root end of the fuel tank.
Once you have access to the fitting, you can tighten it and maybe apply a
little proseal where it goes through the tank rib.
KB
---
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