What is Fuel ?
Fuel is (noun) a substance such coal, gas, oil, petrol or wood which can be burnt to give heat or power What fuel do you use to heat the house? What’s the fuel consumption of your car? We ran out of fuel on the motorway. to add fuel to the flames to make matters worse Just to add fuel to the flames the union leader sent the minister’s letter to the newspapers. (verb) 1. to provide fuel for The power station is fuelled by coal. 2. to increase Our money worries were fuelled by news of an increase in the mortgage rate. (NOTE: fuelling fuelled. The US spelling is fueling fueled)
source: Easier English, Student Dictionary Upper Intermediate Level