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Q:

evaporation leak on 2002 Chevrolet Blazer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
what constitute an evap.leak,and where to find this leak?
(1) Answer
This is a pretty large subject. Here is an article I wrote about for 1 of the more common Evaporative System Codes and there are several. You could start with a new gas cap from the dealer, as Chevy gas caps tend to leak after awhile.

http://repairpal.com/OBD-II-Code-P0442