Our port engine started to smoke recently after we installed 6 Reliabuilt 9215 injectors. We put about 15 hours on it and it ran fine until we were on a run to the dock and she started to smoke. She didn't loose power just billowed black smoke. At the dock she idles well and will smoke when we raise the rpm. We checked the turbos and blower and they seem to be ok. There were no loose air hoses either. I'm wondering if we have failed injectors. Would a clogged return fuel line do this or could a liner have turned and blocked the holes? We'd appreciate any advice you may have.