My parking garage hates my car

So my car has a hard hose/plastic tube under the board that covers the spare. It runs from the filler to the tank I think. It is held on by hose clamps. Is this normal? Is this the leak I am looking for?

I will try to get pics up soon

on the oil leak, I lost my original filler cap and the stant one I got at Kragen seems to let oil out to film the valve cover. Is there a recommended one that wont do that?