Mine broke just like that, BMW said "never seen this before" Wouldn't cover it under warranty On mine, the lower quick connect fitting cracked spraying gas all over me and the bike (it was very exciting). These are tapered npt pipe threads and if overtightened will crack the fitting and the plate. Could be yours, like mine, is the lower female quick connect cracked. The plate had some hairline cracks, but wasn't leaking. I got a brass one from Beemer Boneyard, coated it with yamabond case sealer, and put it back together. It's been holding for the last 10k miles.
Check out post 21 and 23: