The CP4 pump failures have been extensively investigated by the Ford pickup aftermarket suppliers. The problem with the pump design is that first fuel is delivered to the pump crankcase (cam case, actually) for lubrication, then it goes into the top end where the pressure is increased to about 30,000 psi, then to the common rail and pressure regulator. If there is any problem with the cam and pistons, the detritus from it finds its way into the top of the pump and then the whole fuel system - lines, regulator, and injectors. The solution people have developed is to return the fuel used as a lubricant from the cam case back to the fuel tank rather than into the common rail. This will contaminate the fuel tank, but not the fuel system. The latest version of these systems has another fuel filter on the fuel returned to the tank, so it doesn't get contaminated either.
It isn't a problem affecting a huge percentage, but enough that Ford (and Dodge) have kits of parts to address the damage, and aftermarket vendors are supplying solutions. There is a pretty good explanation along with a video documenting the failure and solution
here. Cummins only started using the CP4 pump recently, Ford has been using it since 2015.