A fuel-carrying ship is a type of vessel used to transport oil, coal, and other combustible liquids or gases. TANKER, Coaler, and Oiler are all types of fuel-carrying ships, with TANKER being the most common. Tankers are large ships that carry oil and other petroleum products, while Coaler ships are used to transport coal and Oiler ships are used to transport oil. All three types of fuel-carrying ships are essential for transporting fuel around the world.