ZD30 CRD possible fuel starving loss of power problem with no codes

[Bidja]

So instead of starting a new thread, i may aswel add to this one. Im having very similar issues with my 07 crd. Problems just came out of the blue for me. No build up or anything. I can eventually start mine after some areostart, priming and winding for ages. Mine threw a p0089 code a few weeks ago. So i replaced the suction control valve. No change. I have since put in a new fuel filter, new glow plugs, new fuel lines at the tank and at the filter to the ip, and replaced the primer bulb and nothing has changed. I can drive about 50m under full load, boost drops from 15psi to about 10psi and it just feels like turbo lag. then after a few minutes of driving normally, it just completely dies. I have to pull over and use areostart and prime to get it running again.

Wondering what i should be looking at next. Relief valve on the rail? Injectors? Or a lift pump? Or should i bypass the fuel filter for a moment to see if it will start? Non genuine fuel filter, just an sca one as ive never has issues with them before. Feels like air in the system to me but any other advice is greatly appreciated.

Firstly, CRD do not handle fuel delivery restriction too well so IMO only use Genuine fuel filters.
Based on my experience: 12 months so ago, I experience code P0089 under full pedal and only happened twice (pwr only dropped away momentarily). Then shortly after noticed diesel leaking from fuel pump (over o/s of housing side plate), and needed a rebuild but was advised to install new pump. Installed no further problems.