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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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 Posted: Tue Apr 22, 2014 5:22 am Post subject: Leaking vent line on QB tanks |
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It appears that the blue nut on the vent line inside the tank was only hand tightened by the QB builders. With more than 20 gallons in the tank, fuel started dripping through the vent line. About a cup or more a day.
It's a real pain but it can be tightened through the fuel sender holes, while peeking through the drain hole with a camera. I was lucky enough to be able to borrow a friend's unfinished fuel tank so I can practice... Still without a camera I couldn't do it.
The nut was lose on both tanks (only one was loose enough to leak though).
I heard this happen to others before. So if you have qb tanks it may be worth checking before you install and proseal in the floats.
The vent line was also not bent right on one tank, so the float has no room to go all the way to the top, but that's another story...
Lenny
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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 500 hrs |
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Tim Olson
Joined: 25 Jan 2007
Posts: 2881
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| Posted: Tue Apr 22, 2014 5:57 am Post subject: Leaking vent line on QB tanks |
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Did you have to use a funky custom wrench, or were you able to
use something more standard when using the camera method?
Tim
On 4/22/2014 8:22 AM, Lenny Iszak wrote:
| Quote: |
It appears that the blue nut on the vent line inside the tank was only hand tightened by the QB builders. With more than 20 gallons in the tank, fuel started dripping through the vent line. About a cup or more a day.
It's a real pain but it can be tightened through the fuel sender holes, while peeking through the drain hole with a camera. I was lucky enough to be able to borrow a friend's unfinished fuel tank so I can practice... Still without a camera I couldn't do it.
The nut was lose on both tanks (only one was loose enough to leak though).
I heard this happen to others before. So if you have qb tanks it may be worth checking before you install and proseal in the floats.
The vent line was also not bent right on one tank, so the float has no room to go all the way to the top, but that's another story...
Lenny
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Lenny
#40803
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Apr 22, 2014 6:22 am Post subject: Leaking vent line on QB tanks |
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If you proseal the sending unit to the tank, and that sending unit
fails, you will curse yourself for a long time while you try to remove
the proseal. Just saying, as I steel myself for having to do a proseal
repair on a Mooney tank.
On 4/22/2014 6:22 AM, Lenny Iszak wrote:
| Quote: | -
I heard this happen to others before. So if you have qb tanks it may be worth checking before you install and proseal in the floats.
The vent line was also not bent right on one tank, so the float has no room to go all the way to the top, but that's another story...
Lenny
--------
Lenny
#40803
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=422237#422237
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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| Posted: Tue Apr 22, 2014 1:56 pm Post subject: Re: Leaking vent line on QB tanks |
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Ended up cutting a slot in a shorty box-end wrench so it goes on the vent tube, and hooking up a bunch of long zip-ties on the other end, so i can maneuver it around by holding onto the zip ties.
Lenny
| Tim Olson wrote: | Did you have to use a funky custom wrench, or were you able to
use something more standard when using the camera method?
Tim
On 4/22/2014 8:22 AM, Lenny Iszak wrote:
| Quote: |
It appears that the blue nut on the vent line inside the tank was only hand tightened by the QB builders. With more than 20 gallons in the tank, fuel started dripping through the vent line. About a cup or more a day.
It's a real pain but it can be tightened through the fuel sender holes, while peeking through the drain hole with a camera. I was lucky enough to be able to borrow a friend's unfinished fuel tank so I can practice... Still without a camera I couldn't do it.
The nut was lose on both tanks (only one was loose enough to leak though).
I heard this happen to others before. So if you have qb tanks it may be worth checking before you install and proseal in the floats.
The vent line was also not bent right on one tank, so the float has no room to go all the way to the top, but that's another story...
Lenny
--------
Lenny
#40803
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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| Posted: Tue Apr 22, 2014 2:05 pm Post subject: Re: Leaking vent line on QB tanks |
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A while ago I saw some plastic scrapers on AircraftSpruce, they look like double edged razor blades. I bought some to try them out.
https://www.aircraftspruce.com/catalog/topages/scraperite12-03311.php
Cuts through the proseal like butter, but you have to use it as a knife not as a scraper. It doesn't hurt the aluminum at all. On the face of the sender I just used a razorblade to clean up around the screws.
Lenny
| Kellym wrote: | If you proseal the sending unit to the tank, and that sending unit
fails, you will curse yourself for a long time while you try to remove
the proseal. Just saying, as I steel myself for having to do a proseal
repair on a Mooney tank.
On 4/22/2014 6:22 AM, Lenny Iszak wrote:
| Quote: | -
I heard this happen to others before. So if you have qb tanks it may be worth checking before you install and proseal in the floats.
The vent line was also not bent right on one tank, so the float has no room to go all the way to the top, but that's another story...
Lenny
--------
Lenny
#40803
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=422237#422237
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http://www.matronics.com/Navigator?RV10-List |
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woxofswa
Joined: 12 Aug 2008
Posts: 349
Location: AZ
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| Posted: Thu Apr 24, 2014 2:59 pm Post subject: Re: Leaking vent line on QB tanks |
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Mike Andresen aka Azcloudflyer has a complete tool rig specifically for this problem that he has sent all over the world to folks with this issue. Once the sensor plate is off, it's a 30 second fix.
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014 |
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