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Re: P0440
The cap vent may have internally failed, so a visual inspection won't tell you much. You need to check all vacuum lines related to the evap system and the hard lines running to and from the tank, canister and engine compartment. If changing the cap doens't help, and there are no easily seen problems with the lines, a garage smoke machine will pinpoint the leak for you.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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