There are at least two ways to test your fuel tanks. One tank test method is to fill the tank with compressed air and see if any air leaks out. The air leaks are detected by brushing a soapy water solution on the outside of the tank and watching for bubbles. Hook the tank outlet to a pressure regulator set on it's lowest setting...about 5 psi. Rubber band a latex glove over the filler opening. (Photo 1)
A more practical test for the small time aircraft restorer is the old water test. Simply fill the tank with water (plug the drain openings), and wait. The photo above shows my two tanks filled with water on my patio after after about 2 hours. As you can see, the wing tank had no leaks at all. But the main tank is leaking around the filler neck. Next step: drain the tank and repair with JB Weld. It takes about 2 days for the inside of the tank to dry completely.
The Taylorcraft main tank is installed with two 1/4" steel X rods that pass through tubes in the tank. It is important to cushion the tank mounting. Use two 22" long pieces of 1/4" automotive fuel line over the X rods to give a very snug yet resilient installation. see Photo 2
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link to Fuel Caps, Fuel Gauge, Fuel Valve
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