fuel odor

please help!!! my 190e 2.6 ('91) mercedes has a fuel odor when I cut if off. I tried the fuel cap, no problem. The fuel is emitting from the outside of car, driver side. I haven't raised the hood.

on 3-27-02, I had the a/c ports replaced and recharged a/c system and inspected for leaks (expansion valve leak was replaced during conversion to R134A (this was highly recommended by the technician), replaced receiver /drier, and switches. Does this have anything to do with present fuel odor?

Any suggestions???