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This isn't a "topping off" issue. If the pump is left on full flow, when the auto shutoff engages a good cup or so of gas spits out and runs down the quarter panel.
Like I said - for the last couple of gallons, just fill it at about 1/2 flow. Seems to work well for mine.
I have this same issue. Ive tried the 1/2 speed fill and it still splashes out. I usually just listen closely till I here it about to overflow, then i only get a few drips...