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Q:

smokes on start-up ,smell of spent fuel on 2001 Hyundai Accent

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Just simply it smokes on start-up, and the smoke smells like spent fuel exhaust, very rich though.
(1) Answer
Have a diagnostic test performed to determine what is causing excessive fuel to get pushed through the engine. It's hard to stay the cause until you test it. You could have a leaking fuel injector, an air/fuel mixture issue, etc.