The plans call for an additional leak test for peace of mind. I elected to do both the balloon and manometer tests in combination with soapy water to check for leaks. Fortunately, the only leaks I found were near the hardware I installed for the test itself. The valve stem leaked a little until tightened, and the fuel cap leaked a little through the overlapping seam in the duct tape I used to try and seal it off during the test. Having not built my wings, I was a little apprehensive about pulling off the tanks in the first place. The first one took me about two hours (once I found all of the AN3 bolts) to remove. The second took me a lot less time for removal and attaching.
I used 5/16" clear vinyl tubing for the manometer.
Here's a link to another builder's site that explains the process very well. I checked each tank for about a day with 1 PSI before I removed the tubing and reinstalled the tanks on the wings.
I used a spare 2x3 frame that I wasn't using for my manometer test. Low tech, but effective.
The balloon self-deflates after a bit, and is really just to ensure that you don't over pressurize the tank, so it's helpful for a little while if you just want to use soapy water to check for leaks quickly.
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