My screw is also missing, I just noticed! But it's not causing any problemsI had a problem with my car the last time I drove it, it was cutting out like others have described,
After stripping some other bits off to do various other jobs I noticed the screw had fallen out of the valve on the feed end of the fuel rail (see picture below) and was just sitting in the white cap,
I'm not sure if this would of cured my issue as I've not started it since, but I'd say it was likely to be connected to the issue.
Think we all have screws loose!I may check see is mine there haha