Like another pointed out, you're tank isn't vented. Fix that.
I rather doubt you're buckling the tank from driving it. The fuel pump doesn't
have much vacuum
capability. Much more likely is heat cycling with the tank near empty. Cold
nights collapse a tank
nicely, just watch an empty plastic milk jug.
Yes, it can be blown out with compressed air. Motorcycles have this done
regularly to their highly
exsposed fuel tanks. Probably worth your while to take the tank to a Harley
shop to do, since they
are so familiar with actually doing it.
No, it will not fix the tank perfectly. Creases are creases, and are there to
stay. That also isn't where
the leak are likely to occur. Leaks are most likely at the metal joint seams.
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