Finally got back to working on the 99 I replaced the injection pump on . The number one injection line is plugged and I’m wondering if they are all plugged somewhat . If I soak the lines in cleaning solvent will that free them up
Parts washer solvent overnight - blow em out with shop air after next day. For customer stuff we usually just replace unless we are in a bind for time, don't really see a lot of plugged lines cummins/cat/detroit stuff mostly on the older Isuzu 6HK motors.