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1. 04:10 PM - RV-10 fuel tank vent tube leak resolved (Lew Gallagher)
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| Subject: | RV-10 fuel tank vent tube leak resolved |
Upon first fuel fill on Grant Smith's RV-10, there was a tiny leak from the vent
tube on the pilot's side. The other end of the vent tube by the filler cap was
above the fuel level. When I researched it I found others that had this problem
with quick build wings. It is due to the flare nut on the inside of the
tank not being tightened enough so that the gas leaks into the vent tube when
that union is under gas level. I found a picture of the tool that others have
used to tighten that nut reaching in through the hole after removing the float
sending unit. I made my own tool and tightened the nut which stopped it some
but not all. Further research showed that someone cut an access hole in the
spar side of the tank, found and fixed a bad flare. I was resigned to eventually
doing something similar when an EAA member, Tim Crouch, remembered how his
RV-9 vent tube was designed - which led to my solution.
I drilled two holes in the fuselage wall in the wing root at the vent tube location,
had a 26" Teflon hose with fittings made, connected one end to the tank
fitting, ran the hose through the first hole in the fuselage, ran the hose up
to the bottom of the door sill between the fuse wall and the interior kick plate,
and back down through the second hole with a 90 elbow which connects to the
original vent tube down through the grommet through the lower wing root faring.
Done. This keeps any leakage at the faulty flare inside the tank from going above
the fuel level since the loop at the top of the interior hose is above the
fuel level in the tank. As fuel is used, air is easily drawn past the faulty
flare until the fuel level is below that flair which then drips back into the
tank.
I'll attach pictures.
Later, - Lew
--------
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513150#513150
Attachments:
http://forums.matronics.com//files/tank_vent_5_204.jpg
http://forums.matronics.com//files/tank_vent_4_829.jpg
http://forums.matronics.com//files/tank_vent_3_889.jpg
http://forums.matronics.com//files/tank_vent_2_109.jpg
http://forums.matronics.com//files/tank_vent_1_145.jpg
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