Can you give me the actual "p-code" that was retrieved?
The actual definition for this code is "EVAP System Leak Detected" - this is a tough one to diagnose "by eye" or to say "it's this..." there are a few things to physically check:
Perform a physical inspection of the EVAP system. Inspect for the following conditions:
However- there is a much easier and efficient way to diagnose this. Your best bet is to have the EVAP system "smoked". This is where a machine forces smoke through the EVAP system, and the "leak" will reveal itself with a stream of smoke. Most shops charge around $40-$65 for this service, but it's money well spent. Instead of driving yourself crazy looking for a leak, that may even be in a spot that you can't physically see, find the leak, fix it and be done with it.