Was flying with my wife today and we smelled fuel. It's an old plane and sometimes we smell fuel but today it was strong. We were in cruise and I had forgotten to lean the engine so I decided maybe I am sending too much go juice and its not all burning up and some unburned fuel maybe is coming out of the exhaust or something. I leaned back and the smell seemed to go away. After about 5 min I asked do you still smell it and she said "I think a little but certainly not as bad as before. " I agreed it seemed significantly less.. We finished the flight and landed and went home. I drove back to the hangar to give everything a once over and noticed this: I have only ever seen blue like that around wing roots and tank sumps. I get underneath for a better look The nose gear well is blue. All over, like someone just splashed a pint of Low Lead up on there. I call a MX and we talk through a few ideas and he says "Turn your fuel pump on and see if it is dripping" So I do and I see this: My mechanic comes over to help me take a closer look and this Tee had snapped leaving part of it inside the elbow bracket (I don't know what anything is called) During preflight, I didn't see any fuel on the gear. Runup was fine, and actually the engine was smooth the whole flight. Wondering if I was a couple of bumps away from a much more dramatic day. If you are in flight and detect a strong fuel smell, land immediately? In hindsight, that seems like it would have been the right action. However the odor reduced significantly after leaning the mixture so we were lulled I guess into thinking maybe it was a non issue. I think if you smell fuel to the extent that you notice it and are asking others "Do you smell that?" land the plane and start looking for blue stains.