I would add biocide just to be on the safe side if you're storing longer than a month. I would add diesel fuel stablizer if you are storing longer than 2 months. It may be over kill, but better safe than sorry. You can get cans (bottles) of these at the BoatUS store in Rockville and they are not expensive. ALSO, try $1.99/gal. for diesel fuel near Bowie! Good Luck.
