Quote:
Originally Posted by superapan
If I am to run it in between replacing each part, I assume it's not dangerous to run it without intake manifold? Will it unleash hell sound-wise? I ask cause I share garage with lots of neighbours 
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mmm, noise is not very socially acceptable if you are in a shared garage.
It is possible to replace 4 of 5 plastic lines without removing the inlet manifold, just need to remove cross-over pipe. Banjo bolt is a bit tricky but doable (see pic) So, you could do those first then get it started and then move onto the rest. That leaves one more plastic line to do and the delivery valve seals when you get the inlet manifold removed.
Regarding the leak. Have you removed the cross-over pipe and black plastic engine cover to see if a return hose has perished or coming off one of the injectors?
At 170,000km it is still a baby! That said, rubber is rubber and will deteriorate from age.
A full tank of diesel will help with the starting/priming.