He tried to repair the engine but 'without success'. [=he was not able to repair the engine]
He will never 'succeed in' this business. [=he will never be successful in this business]
I am one of the diet clinic's 'success stories'. [=the diet clinic was able to help me]
(..) Let's get those memories down to long term. Alright. We did not die today. I call that an unqualified success. And, that's it. We love our girl. She's got great friends and a great house. Things couldn't be better. (..)2015 Inside Out