quick question please help

Hello just a quick question my girl owns an 02 sunfire and her engine light came on and i checked the CEL it stated P0442 - Evaporative Emission (EVAP) System Small Leak so i figured that she simply needed a new gas cap so i cleared it put the new cap on and now it has reappeared any idea where i should go from here?

Thanks

re-post your Question over on Cavalier side ,likely to get a quicker response

thanks