Water separator filter on an outboard with a portable gas tank?

"Gfretwell" wrote in message
...
Is the
mfr concerned that...

I suspect that most of these magic potions are little more than a nickle's
worth of mineral spirits in a $3 bottle but I also bet that the engine
manufacturers are more worried that they may contain "hotter" distillates
that
could attack plastic parts in the fuel system.
Since gasoline is a fairly powerful solvent itself I am not sure what an
additive would do. Just run a good water separator filter and burn the gas
in
your boat, don't just store it there. ;-)