You have a gasoline leak in the engine compartment.  It is leaking a very
small amount of gas, but the thing is that a very small amount of gas will
produce a very strong smell.  The air intake for the vent system is under
there too, and it's bringing in the vapors.

The thing about a small leak is that eventually it becomes a big leak, and
starts spilling gasoline all over your hot engine.  This is bad.  Check it
out and find the leak.
--scott

You have a gas leak under the hood. Fix it, and if you don't know how
take it to someone who can as soon as possible.

Chris