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More like the quality of diesel is the problem in the US. That and water/condensation contamination. I won't get into debate whether Bosch should have built a pump that can tolerate crap diesel, but it is the fuel that is the cause. The CP4 is perfectly fine, especially the updated ones.
There have been massive updates to the BMW HPFP due to this. I now have 2 pumps with varying degrees of updates inside, and they have been very much strengthened to not only take a bit of lower quality fuel, but also prevent system wide contamination in case of failure.
I may make a thread that documents the updates with pictures, but I already have the manufacturer specs and revision updates. It's just nice to see it in person.
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-2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs.
-2019 M2 Competition MT, Alpine White. Self-tuned 560hp
-2016 Mini Cooper S, MT. Many plans.
Others:
-E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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