Just read good article detailing how the CP4 injector pumps on Duramax, Ford and Dodge trucks are going to fail due to pump not being compatible with American diesel fuel. This is becoming a large problem in these trucks that hits the owners for several thousands dollars. There is a major class action lawsuit over the issue. Attached are a couple of links. Hope this helps someone who has had the problem.
https://www.carcomplaints.com/news/2018/bosch-cp4-fuel-pump-failures-lawsuit.shtml
https://www.carcomplaints.com/news/2018/bosch-cp4-fuel-pump-failures-lawsuit.shtml
https://www.carcomplaints.com/news/2018/bosch-cp4-fuel-pump-failures-lawsuit.shtml
https://www.carcomplaints.com/news/2018/bosch-cp4-fuel-pump-failures-lawsuit.shtml