Mine was on the line that goes from the purge valve to the charcoal canister. It's a hard line but theres a 6" piece of rubber flexible hose on it right before it goes into the plastic concealing "conduit". Very easy to see when you're under the car, I don't think you even need the splash shield off. It had shrunk and no longer sealed. I replaced with some 5/16" fuel line with a worm clamp on both ends. This leak also caused unfiltered air to contaminate my purge valve and caused multiple purge valve failures before I finally found it.
Hers- 04 XC70 2.5T, 300KM
His- 04 S60 2.4, 310KM
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