Vicki, check the gas cap first. Insure the gasket on the cap is not cracked, and if so, replace the entire cap. Get the cap at Auto Zone, as the dealer price is too high, and an aftermarket cap is very reliable. There are only so many connections in the vapor recovery system, so it should be fairly easy and not too expensive to have the dealer check it out. The EVAP system is a California regulation, and if that check engine light is on when you go to have it SMOG'd, you won't pass.