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  #1  
Old 04-13-2019, 03:47 PM
AeroDog AeroDog is offline
 
Join Date: Aug 2011
Location: New London, NC (near Charlotte), Boulder, CO
Posts: 205
Default New tank is blowing soap bubbles

After inflating the balloon, I discovered bubbles in four places. All the threads I could find with the search function discussed repairing tanks which have had fuel in them, and the overwhelming consensus is that these leaks must be repaired from within. I'm certainly hoping I don't have to open this tank up to do the repairs. The build manual simply says to fix the leaks and re-check. Any advice will be appreciated.

Jerre
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  #2  
Old 04-13-2019, 04:04 PM
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RV8JD RV8JD is offline
 
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Default OT

I like your 'Vette's license plate! Quite apropos.
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Last edited by RV8JD : 04-13-2019 at 04:08 PM.
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  #3  
Old 04-13-2019, 04:14 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Tank repair

Jerre
I've heard of builders pulling a vacuum on the tank then applying thinned proseal or other thin sealant.
The other option is cutting access holes in the baffle, sealing then installing covers. One of our Colorado RV builders did it recently.
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  #4  
Old 04-13-2019, 04:48 PM
funflying funflying is offline
 
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Location: arvada, co
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Jerre,
Sorry to here about the leaks but a little more specific about where the leaks are on the tank. IE around a rivet, on a seam, or a screw?
Larry mentioned the vacuum method and I too have heard of it but never tried it myself or know anyone who did it. Iím also interested in what would used to thin the sealant or what other type of sealant might be used.

Without seeing where the leaks are occurring if it were a around a rivet I would consider removing it and resealing. On a seam I would try cleaning off exposed sealant and use a blade clean as best you can between the pieces and reseal. And around a screw, clean it off, back it out, reseal and put it back in.

None of itís simple but it is definitely better to address it before fuel is in the tank.
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  #5  
Old 04-13-2019, 05:06 PM
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RV6_flyer RV6_flyer is offline
 
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Location: NC25
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Default

Quote:
Originally Posted by wirejock View Post
Jerre
I've heard of builders pulling a vacuum on the tank then applying thinned proseal or other thin sealant.
The other option is cutting access holes in the baffle, sealing then installing covers. One of our Colorado RV builders did it recently.
Sealant is available that is thinner. Search for 890A2 instead of 890B2.
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  #6  
Old 04-13-2019, 05:39 PM
AeroDog AeroDog is offline
 
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Quote:
Originally Posted by RV8JD View Post
I like your 'Vette's license plate! Quite apropos.
It took me a while to figure out where you saw that, then realized it's on my UNC-Charlotte web site. You must be an engineer.
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  #7  
Old 04-13-2019, 05:44 PM
AeroDog AeroDog is offline
 
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Quote:
Originally Posted by funflying View Post
Jerre,
Sorry to here about the leaks but a little more specific about where the leaks are on the tank. IE around a rivet, on a seam, or a screw?
Larry mentioned the vacuum method and I too have heard of it but never tried it myself or know anyone who did it. Iím also interested in what would used to thin the sealant or what other type of sealant might be used.

Without seeing where the leaks are occurring if it were a around a rivet I would consider removing it and resealing. On a seam I would try cleaning off exposed sealant and use a blade clean as best you can between the pieces and reseal. And around a screw, clean it off, back it out, reseal and put it back in.

None of itís simple but it is definitely better to address it before fuel is in the tank.
Two leaks are in the rear corners (one upper, one lower). A third is in the center of a rivet (one that's suppose to be "solid.") The fourth is at the fuel return fitting.
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  #8  
Old 04-13-2019, 06:28 PM
PilotjohnS PilotjohnS is offline
 
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Location: Southwest
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Default been there

Quote:
Originally Posted by wirejock View Post
Jerre
I've heard of builders pulling a vacuum on the tank then applying thinned proseal or other thin sealant.
The other option is cutting access holes in the baffle, sealing then installing covers. One of our Colorado RV builders did it recently.
Been there, done that. Pulled a small vac, sucked in proseal and let cure. I did not thin the proseal and my tanks never had fuel in them. YMMV
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  #9  
Old 04-13-2019, 06:35 PM
DHeal DHeal is offline
 
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Location: Windsor, California
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Default

With the newly-built tank dry of fuel and on your workbench, you will never have a better time to correctly address your leaks. Remove the forward access panel* and fix the leaks from within. Like a roof leak, sometimes the visible external evidence doesn't truly reflect the actual location of the leak. So think like a leak!

*Removing the access panel isn't that onerous a task. Use a thin flexible putty knife to carefully separate the panel from the tank; then thoroughly clean off the old sealant before reattaching the panel with fresh sealant.
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  #10  
Old 04-13-2019, 07:22 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Disassembly

Quote:
Originally Posted by DHeal View Post
With the newly-built tank dry of fuel and on your workbench, you will never have a better time to correctly address your leaks. Remove the forward access panel* and fix the leaks from within. Like a roof leak, sometimes the visible external evidence doesn't truly reflect the actual location of the leak. So think like a leak!

*Removing the access panel isn't that onerous a task. Use a thin flexible putty knife to carefully separate the panel from the tank; then thoroughly clean off the old sealant before reattaching the panel with fresh sealant.
I saw men in Mexico remove windshields and similar parts using a guitar "E" string. The big windshield company uses a similar device. Some sort of high tensile string.
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http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/27/2018. Plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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