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Old 07-16-2017, 06:39 PM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Los Angeles
Posts: 263
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.
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.

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

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.
Allen Maris - 2017 Dues paid
Santa Ynez, CA
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Old 07-19-2017, 04:05 PM
Gusmax Gusmax is offline
Join Date: Jun 2014
Location: Sherwood Park, Alberta
Posts: 9

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?


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