My sheeeetbox smells of gas once it has run for a while. I figured it was the EVAP system after going over the lines and tank carefully. I saw no leaks anywhere. Should I spend the big bucks and replace the Charcoal Cannister (161K miles) or should I continue to work and search for the leak? Since I go to Florida soon, I may just put it up for the winter and shovel all the dirt under the rug.