Okay, so I was having a mooch and I found that Injector 6 looked a bit wet. I then couldn't help but notice there's a.. Half circle opening on the valve cover design and I wondered if diesel could fill that much that it could eventually spill down to the back left.

Anyway, cleaned it like this:

https://youtu.be/S1VAr70os-E

I'm cleaning the back to see if the path of the diesel fuel does actually overfill onto it.

So with toilet roll shoved down by injectors 4, 5 and 6 and decided to idle and maybe see if I could spot anything, but literally 30 seconds after starting my toilet roll was drenched, it just looks like raw diesel..

https://youtu.be/d6g4F78rsqo