Sounds like you have a leak somewhere.
Could either be on one of the fuel lines / unions or on the tank.
The fact that you had just filled it up makes me think that it is probably on the tank or filler line.
Have a good look around in these areas to see if you can locate where it is coming from and take it from there.
Hope this helps.
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Why does it smell like gas in my car?
Whether you love or can't stand the odor of gasoline, a vehicle that smells like gas most likely has a leak somewhere within the fuel delivery system. Since gasoline is flammable, this presents a major hazard and requires an immediate fix.
The problem is that your gas tank "pushes back" like it's full even when it isn't and makes the fuel valve click off. Tom and Ray on Car Talk covered this in a 2007 show and I pasted some of their response below:
"RAY: This condition is probably caused by either a blockage in your gasoline vapor recovery lines or a bad refueling control valve.
TOM: Gasoline vaporizes. How do we know that? Well, when gasoline is spilled, you can smell it, right? What you're smelling is vaporized gasoline.
RAY: And in the old days, when you filled up your tank, all the air inside the tank -- the air filled with gasoline vapors -- came whooshing out through the filler hole or through a vent at the top of the gas tank.
TOM: But then people in places like Los Angeles realized they couldn't see the person standing next to them due to smog. And since gasoline vapors contribute to smog, car makers were forced to install devices to capture those vapors.
RAY: So now each car has a vapor recovery unit that collects the gasoline vapors from the tank and then, the next time the car is started, sends them to the engine, where they're combusted. Your vapor recovery system isn't working, Lottie. One possibility is that one of the rubber hoses is blocked or collapsed."
don't over fill the tank, when it clicks off thats it!! any check engine light? I had fuel smell, and the O-Ring was leaking when I changed the fuel pump. Top of the fuel tank, was leaking only on a full tank, Also evap, pump and hoses do crack and leak but it will show, in a check engine light usually