That's the right idea. It's got to be in the charcoal cannister and/or lines runnung from it to the fuel tank and wherever else. Or the sensor that tells the computer that you have a vacuum on the system could be bad. A diagram of the system would be very halpful. Having it fixed could be simple or a nightmare. I spent a year with an off and on problen with the EVAP system on my wife's Eclipse. I would replace a questionable hose or fitting and the light would stay off for a month or so. Then on it came again. Never did really find a problem. Good news is it's nothing that will ever effect the way the car runs. Good luck.Porkchop said:Fuel cap is where I would have started too.... the evap is the evaporative emissions system that captures fuel vapors in our car's closed fuel system. If its showing a leak with a CEL, then it is probably leaking somewhere. Maybe trace the return fuel line back to the tank? Check under the back seat and be sure there is no leak? Check the charcoal canister (I think it's under one of the rear fenders...) The fuel system diagram from a Bentley manual would be helpful.