I don't think this came from my car
 

but it was in the washing machine after my pants were done.
Any ideas?
https://cimg9.ibsrv.net/gimg/www.jag...a9ad3fe987.jpg
https://cimg2.ibsrv.net/gimg/www.jag...eaf77b1c94.jpg
https://cimg4.ibsrv.net/gimg/www.jag...fe60f65ace.jpg

lt looks like a locking clip for a electrical connector of sorts.

lm pretty sure you dont come across it in a 1999 XK8 from the cylinder heads upwards.

The locking clip for a fuel line to rail or filter?? just throwing that out there. TM

"grenade pin" for something spring loaded, clock spring maybe

Fuel door emergency release?

I have never actually seen mine, so can’t say what it looks like.