Fuel Posted on 11th November 20151st September 2020 by ThePD (The Project Definition) A Fuel is a substance that is used to provide heat or power, usually by being burned. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Substance and tagged energy, gas, oil, product. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.