unless thats Tygon fuel line or equivalent its the wrong type of hose & that could be the problem - it looks like standard nylon tubing.

If its a coupe there's a heck of a lot of return vapor line running around the trunk area for the emissions system (at least US model) that could have a leak & produce the smell. Having just replaced it all after sorting it out where it went from pic's I can see how it could be hard to find.