A lot of people are saying baffles, and they are quite wrong, the vast majority of road cars do not have any fuel tank baffles of any kind. The signal input from the level sensor is just heavily dampened, giving the dash enough time to display a reasonably accurate average.
In over 20 years of being a mechanic I think I have only seen one fuel tank with baffles, and that was mini club racer with an aftermarket FIA tank, and it’s not baffles like you would think, more foam blocks.
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