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The key to doing a pressure test is in how you seal the tank and how you fill it. I have not pressure tested one in a boat but have done many automotive tanks at this point. I always disconnect all of the lines and plug them(you can usually do that by sticking the correct size bolt in and using a hose clamp. I have found that you can usually put one fuel line around the end of the air valve and clamp it there. I have seen people who have much slicker setups where they have a valve, gauge and hose barb/pipe fitting all in one.
If you fuel tank is accessible, once you get it up to pressure, put some dish soap in a squirt bottle and hit all of the possible leaky areas. Any bubbles that you see indicate a leak.
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