O que é fuel? O que é fuel? Something consumed to produce energy, especially:A material such as wood, coal, gas, or oil burned to produce heat or power.Fissionable material used in a nuclear reactor.Nutritive material metabolized by a living organism; food.Something that maintains or stimulates an activity or emotion: "Money is the fuel of a volunteer organization” ( Natalie de Combray). To provide with fuel.To support or stimulate the activity or existence of: rhetoric that fueled the dissenters. To take in fuel.