Using command
mods.thermalexpansion.steam.removeByInput(item('minecraft:coal'))
Nothing happens, coal burns in it and gives default value.
mods.thermalexpansion.steam.removeAll() also doesn't change anything.
It is however possible to instead set their fuel value to 1 but not to 0, setting it to 0 causes same thing as trying to remove it: defaults to original value.
Example command: mods.thermalexpansion.steam.add(item('minecraft:coal'), 1) -> works fine and only generates 1 RF
Example command: mods.thermalexpansion.steam.add(item('minecraft:coal'), 0) -> defaults back to 16000 RF