This is one of those cases where I forgot what I learned. Certain braided lines are leak prone (which you've already learned). From what I remember it is the rubber inside that becomes porous. I watched a friends car actually spraying raw fuel from his lines. We couldn't believe our eyes! They were not leaking from fittings but right through the braided steel weavings! You have to request the fuel friendly braided lines. The dummies behind the counter won't recommend it to you until you go back to the store and tell them the line you just bought is leaking. Luckily I had four friends with this problem before I installed my fuel system in my cobra. It's funny, we assumed the first car that did it just had a defect and my friend just replaced the lines thinking it was fixed. Then three other cars started leaking within a month of each other and that's when we started asking around.
If you're only smelling fumes at this point, consider your self lucky and remove all of it quickly. It's only a matter of time before raw fuel starts spraying out from everywhere! I'm all for excitement but the excitement of opening the hood on the side of the road and finding raw fuel sizzling on hot header tubes I can do without!
