I have just purchased a boat that has been setting for around two years
without being in the water. The boat's internal tank is about half full of
gasoline/oil mix. He should have used StaBil to Stabilize the gasoline in
the tank but didn't and now I have a boat that's been setting for a couple
of years now (yes years) with the same Gasoline in the Boat's tank. It's an
Evinrude 175HP Outboard motor and the tank is a 14 gallon (I think) Internal
tank that is about half full of fuel. I don't want to attempt to start the
boat, with the fuel that's' in the boat now unless I can know I can take
precautions that won't cause the fuel to damage my motor.

Is there any additives that I can put in the tank that will revitalize the
fuel (Octane boost)that is there now or do I just need to pump as much out
as I can? Since it's half full would filling it up with High Octane Premium
gas along with additives help or keep me from having to drain out all the
fuel that's in it now?

I appreciate all your answers, in advance.