After running my car, the engine area of my car smells like gas. I can smell it just from getting out of the car (I don't have to go under the hood). If I turn the A/C or heater on, gas fumes come through the vents. I'm not losing gas at an abnormal rate. I'm not going through a gallon a mile or anything ridiculous like that. I don't know much about cars, but I can fix most stuff once I figure out what the problem is. I really can't afford to go to a mechanic. Any suggestions as to what I should be looking for?