If you look in the PET page 58 it shows a sealing ring around the fuel pump pn 321-919-133 I suspect this is rubber & yours is cracked/dried out which is causing the smell. This would be what I would look at. Other thing it could be is the fuel cap leaking out but if that was happening you would most likely throw a code for it.
This looks like it could be a generic VW part also from searching.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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