Thanks Parrot for taking the time to post the 'how to', great detail and pics.
After a head rebuild I think this maybe the problem on my non starting OM 605 (non turbo)
Fuel pressure relief valve adjustment
Pretty much covered everything else and the Bosch engineer said the seals may have stuck open allowing fuel back and not maintaining enough pressure to crack the injector open.
Sounds plausible as car has a long history of standing not being used before my ownership, i also ran it on svo with a twin tank set up but some of the veg oil may have clogged it.
Do you think this maybe possible?
Thanks again,
David