I wasn't having issues, but I ran a few cans though my fuel system through w/o incident. I don't know if it helps, but it didn't cause any issues.
-Jon
PS: it's not diesel, but I did run it through my lawn mower and it started easier with the same fuel, same oil and same spark plug. The only difference was adding a bit to the fuel.
I've also used it to clean carbon deposits from a bbq grill. It worked well.
I use Sea Foam to clean my EGR valve each spring (in the spray cans) - it cuts thru the carbon build-up. I add Stanadyne to the fuel system - in the warm months to raise lubricity and in the cold months to reduce gelling (2 different formulations).