Evap Leak

I have a 97' Tiburon and my engine light turned on, when i checked the code it said that i have a small evap leak. I heard that the most common problem is caused by the gas cap, so i replaced the gas cap and erased the old engine code and the code came up again within a day. I know where the evap lines are and where the evap vapor canister is located but what i don't know is where the " small leak " is located. Is there any kind of tricks or tools that are avaliable to help locate this kind of problem? Any suggestions are appreciated.