my 07 only has paint around the opening for the fuel - I used a flashlight and a mirror to check - the only stuff in the tank is overspray from them painting the filler neck... but it's a lot of overspray - and I think it dries up before it hits the inside surface - which is why it's not sticking there, and coming loose, clogging up my fuel tap screen.
at 220 miles on the clock, there was a good enough amount of sediment to prevent about 1" of fuel from going through the screen. Not sure what that relates to for gallons....
easy to fix - pull the tank, pull the tap, clean the tap (I took it apart, cleaned, and reassembled). flush the line out with carb cleaner - swish a little gasoline through the tank to rinse any loose sediment out. Reinstall the tap.
I checked it again at 1500 miles (installed a pingel fuel tap) - it was still very clean - so I think , in my case, it was the overspray drying before it hit the inside bottom surface of the tank, at which point, a few tanks of fuel were enough to wash it on down to the fuel tap. My honda isn't painted inside the fuel filler neck.... wonder why they do it?