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The phrase "are fuel" is correct and usable in written English.
It can be used when discussing the role or function of something as a source of energy or motivation.
Example: "These innovative ideas are fuel for our creative process and drive our success."
Alternatives: "serve as fuel" or "act as fuel".
Dictionary
are fuel
verb
To provide with fuel.
synonyms
Exact(56)
They are fuel".
Another form to electrochemically store energy are fuel cells.
The Kurds' hopes for independence are fuel for Musher.
And then there are fuel cells themselves though they are still some way off.
The loose weapons are fuel for crime and violence between competing militias and against foreigners.
Also included are fuel and feed prices as well as a price trend analysis.
Tom Pinchbeck explained that the two major costs in growing roses are fuel and labor.
Similar(4)
They are fuel-efficient, rarely taking longer than 15 minutes to prepare.
The petits are fuel-efficient and perfect for one or two passengers.
Hybrid cars are fuel-efficient and produce low carbon emissions, a byproduct blamed for such environmental problems as global warming.
As for that transmission, seventh and eighth gears are fuel-saving overdrives, allowing the engine to turn at a more relaxed r.p.m.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com