Stimulates (5)
'stimulates' is the definition.
(fueling is a kind of stimulating)
This is the entire clue.
(Other definitions for fuels that I've seen before include "Substances consumed to produce energy" , "Substances that provide heat or power" .)
'stimulates' is the definition.
('excite' can be a synonym of 'stimulate')
This is the entire clue.
(Other definitions for excites that I've seen before include "Arouses feelings in" , "Stirs up, stimulates" , "Animates" , "Stirs up, rouses" , "Makes eager" .)