Car: 2001 E430 Sport

I was sitting at a stop light, the yellow low fuel light started flashing and the CEL light lit.

After I shut the engine off, and later restarted, the low fuel light was no longer flashing.

I pulled two codes:
P2013 - Purge System Gross Leak Detected
P2001 - EGR System Malfunction

Can somebody give me a hint on where to start? How is the Purge System diagnosed? Where is it? I have no idea what the purge system is.

The car seems to be running fine, both before and after I was warned with the flashing light and CEL.

__________________
Thank You!
Fred
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