While you could certainly do it, you would have to deal with the availability issue previous posters mentioned, plus seperate tanks
, preheaters, etc. if you're handy and don't mind being dead in the water
fixing things at anchor
, go ahead. You would have to be a real enthusiast to make it work I think. If you have a restaurant, and it makes sense not to sell it, that's another story! Still with barrels/tanks of oil, you will have a bit of a mess on your hands.
As far as biodiesel goes, I don't burn in in my boat but I burn a ton of it at the farm. I've had to change fuel lines in my truck and older combine, and I've got a bunch of late model green tractors that tolerate it fine. I never let it sit for any amount of time, as it is hydrophilic and also eats at any natural rubber in the fuel system. Seems like a bad fit for a boat and you won't find it on the fuel docks anyway.