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Testing Fuel Tank for Leaks

cowboyup3371

Forum Guru
Past Site Supporter
After attempting to seal my tank earlier this year with the POR-15, I found a couple of small leaks have developed causing the paint to bubble up but nothing is ever on the ground. I found a 550T tank on EBay that I'm looking to purchase if the seller relists it since I couldn't afford it right now after buying parts for Charmayne's bike this weekend.

If I can get it, how much fuel do I really need to add to the new tank to test if it is leaking?

Are there other ways of testing it or am I better off at just slapping it on the bike and hoping for the best?
 
If it has a liner you can just fill it with water and not worry about rust. Or you can fill it with gas and set it on a new sheet of cardboard to see if it leaks. Least the gas wont promote rusting.
 
If I can get it, how much fuel do I really need to add to the new tank to test if it is leaking?
MOST of the time, the leaks will be at (or very near) the bottom, because water is heavier than gas and settles there.

The only leak I have had was about an inch from the bottom of the left side.

.
 
I've seen several tanks with pinholes on the top crown. Presumably there was some condensation that rose in the tank. Mostly the leaks are on the bottom though.
 
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