I think a lot of the reaction that you formulate ought to relate to the totality of the smell.
Like for instance if the gasoline smells considerably strong and persistent that would be a real concern and need immediate attention.
While on the other hand if the gasoline smell is just occasionally sensed and is wiffy like when you pass a gas station at times, well, then that is a different thing.
I on occasion get a gasoline smell and attribute it to the gas cap and seal which is probably not perfect but there has never been an instance where gasoline has escaped past the cap. So I don't worry about it!
How you approach this dilemma should have input from what you sense is the problem.
If you cannot see any gasoline dripping or leaking, the problem is seemingly, not big time serious, and should not encompass any large mechanical foray.
***
I agree. I do smell gas from the fuel cap occasionally, usually on hot days, but this is coming from under the tank. It's not overwhelming, and I haven't seen any liquid gas dripping. After seeing the condition of some of the rubber I'm gonna go ahead and replace it all as a precaution. It's all OE as far as I know... I'll be able see things better with the tank and air box off, and I've got o-rings on the way in case we find any leaks. Hope I won't need them.