First thing - I have found from experience that the use of the diesel treatment you mention makes not one jot of difference to the running of the car or to the chances of poor running due to injector fouling. The proper (and rather expensive) additives, with cerium, do make a difference to my pre-DPF car. If you car has a DPF and uses Eolys fluid, then that's really all you need. The Eolys fluid uses cerium oxide as the active ingredient and reduces the temperature at which the soot (diesel particulates) burns, giving a cleaner combustion.
But if you need to use an additive (and my 06 Fiesta has a more simple fuel flap. I haven't seen the type on your 09 car) then I would suggest fitting a wider, longer, length of pipe to your funnel (sorry, you say you've tried that), but I suppose it'll have to be a pipe of about the same dimensions as a fuel nozzle. How about a short piece of copper plumbing - say 22mm?
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