The only sure fire way is to pressure test it. This can be a little involved and has to to done right to have confidence in the test. I do this at least once a month in a non boat petrol tank application, but same principles. PM me if you require details. regards T.
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Running around like a head with it's chicken cut off.
i would say the same as linda, but otherwise empty it then put it in a tank of water see if you get anything inside
try it!!
but if you do you need to clean it so no water is still in there if you reuse it
