Fuel restriction spn95 fc 2343

[W9L]

Still waiting on inline 6, so I really don't know. Put 6pack of injectors in in Feb. Would not shock me if it had a leaker. The test you refer to is done through the ecm isn't it? Something straight forward I can get one of the guys at KW to run through pretty quick. So many people with Covid /Delta around here the shops are all a week behind. And quite honestly I prefer to do or my own troubleshooting or oversee it anyway. Just baffles me how great it ran for the first 2000k mi after the lines and such were replaced then it started going downhill for the next 1000k mi until it derated. Made me wonder if possibly the pump might be getting weak and by replacing lines and such it might have masked the problem temporarily?