This is a toggle command, running it again while targeting the same dino will disable it. It will give the Mek that you are looking at or riding infinite maximum fuel. This is different to the Reset command because the fuel will not run out until you toggle it off.
Find below information relating to the Dino InfiniteFuel command in Ark.
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This is the only way to use the Dino InfiniteFuel console command. If you haven't already enabled infinite fuel for the Mek under your crosshair (or that you are riding), this command will enable it, otherwise, it will disable it (toggle it off).