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Old 10-09-2018, 02:13 PM
77bonanza 77bonanza is offline
Join Date: Jan 2016
Location: Gravois Mills, MO
Posts: 23
Default QB Wing Tanks

First of all let me qualify that I am a first time builder and will ask stupid questions.

I have QB wings. I have seen where many builders are removing the tanks and doing leak tests. Is this necessary? They come from Van's installed and tested. Why not just test for leaks with them in the wing and if none are found you do not have to remove the tank. If you do have a leak then remove the tank and investigate further. I know I am oversimplifying this and am asking for guidance as to how I should proceed.

Thanks and thoughts?
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Old 10-09-2018, 03:01 PM
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N804RV N804RV is offline
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 440

Why would you not? I wouldn't assume anything about quick build. Take the tanks off, visual inspect as much of the tanks and the wings as you can. Do the leak test on each tank. Then, put it all back together, leaving nothing to chance. -JMHO!
Ken W.
Mount Vernon, WA
2018 VAF Supporter
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Old 10-09-2018, 03:06 PM
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RONSIM RONSIM is offline
Join Date: Feb 2008
Location: Largo, FL
Posts: 872
Default Leave them alone

The tanks on our -10 were just fine ---- if it were me, fly the plane unpainted the first several hours ---- work all the bugs out and, if a leak develops, then remove and fix --- chances are they will be just fine.

RV-10 Co-built, maintained, flown (sold)
RV-8A Maintained and flown (Sold)
RV-6A Bought and Flying (N177RV), upgrades $$$
IO360, 180HP/CS, AFS 5600T, D10A, G650, G430, G327, ADS-B, VIZ385 AP
Very Happy Contributor
Based at KCLW (Clearwater, FL)
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Old 10-09-2018, 03:19 PM
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bkervaski bkervaski is offline
Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,028

So far so good on my QB 14 tanks .. no leaks .. (knocking on wood)
#140376 RV-14A QB IO-390 Thunderbolt
Registered: N196
Progress: Flying!
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Old 10-09-2018, 04:10 PM
Discus2b Discus2b is offline
Join Date: Mar 2016
Location: Willis Gliderport
Posts: 55

No leaks on mine.
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Old 10-09-2018, 04:44 PM
Jake14 Jake14 is offline
Join Date: May 2014
Location: Seattle
Posts: 206

Had a vent tube leak on the left QB tank

Now 1 yr later, the right QB tank vent has a slow drip.....

These vent leaks can't easily be tested with the tanks on or off the plane, just have to wait and see if it happens

I would just do the standard leak testing with the tanks in place before mounting the wings. Not really much of interest to see by removing the tanks...
RV-14A #140158 flying
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Old 10-09-2018, 04:58 PM
MElstien MElstien is offline
Join Date: Jan 2013
Location: Kinnelon NJ
Posts: 120
Default Leak Testing


RV-10 builder but I think RV-14 is very similar

Leak testing the tanks can be done with the tanks installed but you will not be able to see identify any leaks on the baffle side of the tank or the outboard most rib side.

My suggestion, take them off and test completely. My QB tanks were fine. It also gets you familiar with the process and requires you to check the torque on the screws.
Builders Blog
Northern NJ
RV-10 Builder
Tail Kit delivered 6-2013
Started building April 2014
Empennage completed
QB Wing and Fuse Delivered December 2015
Finishing QB wings on September 2018
Moved to Port Orange FL November 2018
Project moved to Port Orange Feb 2019
Dues Paid through 2019
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Old 10-09-2018, 05:14 PM
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czechsix czechsix is offline
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 339

If they were my QB wings I'd simply test the tanks installed on the wings with a water manometer (just like I did with the tanks I built for both my RV-8 and -14). No need to remove them from the wing unless there's a leak and you can't find it on the outside anywhere...then you'd need to pull the tank off the wing to fix a leak on the aft baffle.

There are other threads about various ways to do leak checks...some people don't like the manometer method because the level will fluctuate with changing atmospheric pressure. This is true, but I left the manometer installed for over a week on each tank...while the level fluctuates a bit, eventually if there's a leak the 'average' water level will drop to the neutral point. The hardest part about leak checks in my experience is sealing the filler opening. I found some 4" wide vinyl tape online so I could completely cover the opening with one piece and that did the trick.

Good luck,
Mark Navratil
Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
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Old 10-09-2018, 05:33 PM
mturnerb mturnerb is offline
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 905

For me the main reason to remove them was the installation of fuel senders: the easiest way to test the fit of the bends in sender arms was to repeatedly flip tank over - not possible when on wing/stand and very difficult to manipulate the sender arms otherwise.
Turner Billingsley
RV-14A In Progress
N14VB Reserved
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Old 10-09-2018, 05:36 PM
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Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,918

No leak test will find the “weeping rivet”.

I put the tanks on the bench and put 5-10 gallons of 100LL in each. I let them sit for a few months in various postions looking for any telltale blue stains.

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