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			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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