I really can't see the tip of this valve as the picture is not very clear but I would say that the presence of metallic flakes indicates a pump failure and yes, the entire system needs to be replaced. Since I can't see it closely, I suggest you go to the 6.7L Job Aides on PTS and look at the 6.7L Fuel System Contamination Diagnosis job aid to complete your inspection and identify any possible contamination. I would dare say that a lack of evidence would mean it's a warranty repair. No rust, no signs of DEF or gasoline means it is covered provided the vehicle is within the warranty period. I would run my findings by the Hot-Line after completing the inspection be fore proceeding though.