The original recall (I had a 2006 Fusion), was to put in an insert in the filler neck, because they were seeing the neck crack and break under stress from riders bumping it or over-tightening of the cap. The insert was superglued in, and served as a strengthening device (and restricted the hole as well...) BUT, like on mine, because the instert was a "put the adhesive on and get it in there right the first time" kind of thing, if they missed or the glue set up to fast, they would cause other problems. Mine wouldn't seal any more properly, and I was spilling gas all over. So then, they just decided to replace the whole tank with the new spec one.
As Paul Harvey used to say...... And that, is the rest of the story.......