I have a Mercury 9.9 that uses an external 6 gal orange fuel caddy with siphon bulb and fuel line. Someone told me recently that I should refresh the gas in the tank if it has been in there for a long time. I typically use only 1-2 gal out on the water so some of the gas may be up to a year old. I use STAB and the correct oil mixture, just wondering what the shelf life on gas is in a hard plastic tank?
Thank you
Thank you