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You have a leak in the EVAP system (gross leak). Make sure the fuel cap is on tight and good. If it is, this is what I recommend. The EVAP system is designed to have fog forced into it. Have the system fogged. Where ever the leak is located, the fog will come out. If you try to find it without the fog, it will drive you crazy and you will most likely not find it. One other thing to check is the filler tube where the gas is put into the tank. Make sure it isn't rusted and have holes in it.