Due to stack limit (and I think recipe limits(?)) the fuel processor cannot output more than "200" fuel units at any one time, even with more output slots.

Yuoki adds in a few "end-game" fuel that generates 300+ and 1000 fuel units.

I suggest adding a filter that checks if the generated amount is > 200, then don't generate that recipe.

Edit:
1) its really 1053 units, i found out how the recipes were being generated.
2) i noticed it didn't check the "stack input" limit either. So the amount required may end up being more than fits in a stack.

I modified line 54 onward with these checks:

      if (recipe_out <= data.raw.item["vehicle-fuel"].stack_size) and (recipe_in <= item.stack_size) then
          data:extend({ recipe })
          data_util.recipe_require_tech(recipe.name, "fuel-processing")
      end

If you think there is a better way to implement these checks, then feel free :) But this successfully removed the 2 yuoki recipes from the fuel processor that would have generated 300+ and 1000+ fuel units and thus not stack. I was unable to check the stack_in portion but I figured it would be good to include as well.

Haha I can't edit the 2nd text box anymore, but basically (prototypes/recipe/recipe-vehicle-fuel.lua) was the file.