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New here and for the last few years. My wife's 2000 grand prix with 3.1 is throwing the evap code P0440. Cleared it and CEL stayed off for about a week. New gas cap last year. I'm tired of chasing this. Car runs great. Minus the slight lifter noise. Where can i look at for a leak. It started as a small leak on my scanner now its bigger. Im leaning towards the filler neck.