Yup, it's in there - maybe a guider for when the outer case drops onto the tank? It sits in the well immediately above the filler hole for the tank - I think this is what made me wonder if it was designed to take fuel beyond the inner tank filler hole level. It just worries me that even when the lower 'hole' looks full of fuel, a steady squeeze of the filler nozzle can keep trickling more and more in, and to date, I haven't seen a puddle under the bike!!