British spelling of 'fueling'; present participle of fuel, meaning supplying fuel or causing something to develop.
From 'fuel' plus the progressive suffix '-ing'; British English preserves the '-LL-' doubling from 'fuel' before adding '-ing', while American English drops one L.
The British 'fuelling' vs American 'fueling' difference is purely historical—British spelling conserved the doubled consonant, while American spelling simplified it, a pattern you see throughout both varieties (traveling/travelling, labeled/labelled).
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