Oh that's indeed a fun one. I guess Kubota thought it was a good idea to get rid of the strainer on the fill neck?
My only fuel storage is only a 8 Gal container that serves both my tractor and homemade backhoe. Being a somewhat low storage volume, I don't get fuel sitting too long and any trash on the fuel typically sits on the bottom since it has a ball valve about an inch or so from the bottom. Even if it did, the strainer on the tractor would've caught it. The smaller stuff gets caught by the filter.
On this tractor with the the fuel tank by the steps, makes it very easy to fuel. Just put it on the floor and open the ball valve. Of course that doing this way only works for comically small operations like mine. It's not pratical at all for some actual farming with lots of equipment.
View attachment 753591