How Long Can Diesel Fuel Sit in a Tank?

Diesel fuel can be stored for 6 months to 1 year when stored properly at normal temperature conditions.

Conventional diesel fuel, also called No. 2 Fuel, has the most stable properties, but diesel is available in blends with biodiesel, which has up to 99 percent biodiesel. According to the Wisconsin Department of Commerce, as the diesel blend contains more biodiesel, it becomes more sensitive to cold weather and loses shelf life.

British Petroleum cautions that zinc and copper will react with diesel fuel, changing its properties. Water and high temperatures also make diesel fuel less stable.

Only store diesel in tanks specially designed for that purpose, made of non-reactive materials. Be sure to limit water in diesel fuel tanks and drain tanks often. Ensure tanks are tightly closed and protected from dust and debris.