If it starts on easy start its definitely fuel pressure related, you need to get it on live data. When cranking let us know what the high pressure is reading. It could be as simple as a failing o ring on the high pressure regulator.
Glow plugs aren't needed to start the M47R in this country, the fuel is injected at over 4000psi when starting, compressing the fuel and injecting gets it warm enough.
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