Unless agitated...just pump/drain the water
tank without a bottom drain is useless no matter WHAT ANY safety
organization has to say.
The trick is to get ALL the water
out...any water does the engine
, leftover fuel
and tank no good.
DON'T use any additives to get the water out...you don't want to suspend water in the fuel
...NOT recommended by many engine
manufacturers. Alcohol is only OK if you wind
up getting rid of the entire tankload so why add the alcohol to begin with?
If you feel like you got all but a tiny bit of water out...then agitate the crap out of your tank and burn up a lot of fuel...in other words take a nice sea run with plenty of water separating filters and Sea Tow!!!
Most of the stuff posted here make me cringe...ask a good diesel mechanic
or post somewhere sailors are the minimum...like a trawler
forum where the diesel is their lifeblood...sailors might be informative about sails
but so far many are way off base on diesels and the fuel (some are dead on but hard to pick out).