[GordMay]

alohaboat:
It appears that you have "tested" this particular system, and having found the product satisfactory, could be excused for moving on to the next stage, and prommoting a good solution to a common problem. Of course, I cannot presume to know your specific situation, nor the details of any possible conflict of interest. My comment is directed, only to the view from our side of the equation.

I agree with alohaboat, that it wouldn't be wise to keep fuel tanks empty, at least for "shorter" durations.

If, however, exigencies dictate an empty tank, for "longer" periods, you might consider proper de-commisioning of the empty tank, with an inert gas.

Also like alohaboat, I suspect that the dead carcasses of the "hum-bugs" (killed by biocides) can be just as problematic as the live bugs. I have no specific "proof" of this suspicion.

Good thread, /w good info' ...