The internet has practically ground to a halt because of the extraordinary amount of traffic on Diabetes-related websites, Facebook groups etc., from people having problems using Fiasp in a pump. Reported problems vary but include:
Worked well for a couple of weeks, then ISF plummeted so TDD went up
Worked well for a while, then started getting major site inflammation/irritation problems
Worked well for a while and but needed a lot more basal
Worked well for a while but then had to use more insulin per gram carbs
There have been some suggestions that Novo really cut corners in their testing programme by using very few pumpers. Most test subjects were on MDI. Although the problems reported seem varied, they can all be explained by problems at the infusion site.
This might be one case where the extreme caution of the FDA is actually justified