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  #11  
Old 07-16-2017, 06:39 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Los Angeles
Posts: 264
Default My way

I just finished my tanks. Here is how I did it. I bought some 1/4" plactic tubing from home dpeot. Heated the end upmand pushed it over the tank's vent to flare it. Added a B nut and AN sleeve and hand tightened it onto the vent fitting. Blew into the tank until i couldnt blow any more, took a swige of water and blew that into the tube for about 30 inches then kept on blowing until it filled up the manometer half way ( both sides level) . Stoped blowing and the manometer settled at about 24 " of water, which is just shy of 1 psi. Then i bubble tested all the joints and let it sit over night. My breath in the tank cooled over night and I lost 1.5" of water, but the bubble test showed no leakage.

After reworking the second tank, i add a second tube on the fuel pickup. One with water for the manometer, one to pressurize. This made it easier to fill with my breath without have to push a swig of water into the tube. I just used a 1/4 inch punch to seal up the pressurization line. Easy peasey.
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John S

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  #12  
Old 07-19-2017, 03:48 PM
amaris amaris is offline
 
Join Date: Feb 2015
Location: Santa Ynez, CA
Posts: 100
Default

After about 4 days, I've lost about 5" of deflection from my initial pressure. Which was about 12" total in a 3/8" ID tube. The tank is obviously holding at this pressure and I couldn't find any leaks at the full 12" of pressure.

Is it possible to have a leak only at higher pressure and be leak free at the lower pressure and still be okay?

I want to do one more full pressure bubble test to see if I can find anything. I'm also worried about over pressurizing the tank and doing damage.
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  #13  
Old 07-19-2017, 04:05 PM
Gusmax Gusmax is offline
 
Join Date: Jun 2014
Location: Sherwood Park, Alberta
Posts: 9
Default

I'm not sure if this has been mentioned in the past, but has anyone had success building a plastic lined water tank and submerging the fuel tank under water to look for leaks?

Cheers,

Phil
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  #14  
Old Today, 08:23 PM
JimWoo50 JimWoo50 is offline
 
Join Date: Oct 2005
Posts: 336
Default I poured fuel in them

About a gallon and a half. Left it on ends overnight, standing with aft side down leading edge up and leading edge down in the cradle. I tried to orient the tanks over about a week so the fuel would be concentrated on every seam or rivet hole.
I did try the balloon method on my first tank but was leery of over pressurizing the tank and was not confident in the result because it showed my first tank being leak free. And lo and behold it was!
The second tank was a different story and required access holes in the baffle where I squeezed the proseal out of the seam and set up a minor seep.
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  #15  
Old Today, 09:05 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Los Angeles
Posts: 264
Default Bubble test?

Quote:
Originally Posted by amaris View Post
After about 4 days, I've lost about 5" of deflection from my initial pressure. Which was about 12" total in a 3/8" ID tube. The tank is obviously holding at this pressure and I couldn't find any leaks at the full 12" of pressure.

Is it possible to have a leak only at higher pressure and be leak free at the lower pressure and still be okay?

I want to do one more full pressure bubble test to see if I can find anything. I'm also worried about over pressurizing the tank and doing damage.
I used 24" of water and only lost 11/2". But the soap bubbles are what showed the leak. Inwouldn tworry about over pressurizing if the pressure is less than 27" which is right about 1 psi.
__________________
Thank you
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for thier use.

Extra dues paid 2017, worth every penny

RV9A- Status: tail feathers done less tips
Wings 50%
www.pilotjohnsrv9.blogspot.com
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