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Mike, the difference between draining overboard and into the bilge, is that at least you get a second chance to catch the spill before it gets out of the bilge. The volatiles from the gasoline may evaporate (from a small or slow spill) and leave just the less explosive portions--which can be absorbed and disposed of.
But, why is anyone talking about tank sealants and pickling when you've installed a PLASTIC tank? Plastic doesn't rust, it doesn't form crud, it doesn't need pickling.
If you are keeping the gasoline for more than 90 days, that does break down and you need to add "stabilant" to the gasoline. The stabilant prevents some of the normal varnishes from forming and compensates for the more volatile compounds (heptane and butane) that normally evaporate from the gasoline.
Use stabilant, keep the tank topped up, and shut both the supply and vent lines when the boat is not in use. You won't need to do anything else. Although I'd still use a filter funnel, baja filter, etc. when fueling up--might as well stop the crud from coming INTO the boat in the first place.