97 Jimmy Slow Evap Leak

Hi have a 97 Jimmy that has been giving me fuel trouble for a while. The lines in the back above the left rear tire were pretty rusted.
First the brake line went. Then I had a leak in the tank. I replaced the tank, pump and fuel/ vapor lines. Only 2 are left that aren't replaced: the 2 that connect to the charcoal tank. Every month or so now I get a slow leak code: P0442. It could be one of the old lines, one of the connections I replaced, anything.How does one go about finding where the leak might be? Every once in a while I get a slight smell of fuel but mostly it's find. Is there a definative way to find the leak?
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