Do any of you guys use fuel additives in your diesel trucks? I just recently had to replace the fuel injector pump and lift pump in my 01 cummins, $2500 My mechanic said that the new fuel was killing the pumps in the older diesels. However the pumps did have 123,000 miles on them. Anyway's, my mechanic recommends and sells fuel additives and I wasn't sure if he was just being a good salesmen or if the stuff really does help. Thanks!