Philip is exactly right. Fuel leaks (especially as a fine mist) does not a good driving experience make.
The fuel filter is on the passenger side if the car in front of the fuel tank, it's held up above the rear axle with a little round clamp. Sometimes where the plastic fuel lines attach to the metal fittings that bolt to the filter start to separate, and sometimes the rubber sealing washers that go from the fittings to the filter leak. Sometimes the tank seals like Philip mentioned go bad also, or maybe the line is pinched.
You will have to get the car up on jackstands and get under there to see where it's coming from regardless. The nice thing about leaks that makes them (usually) easy to fix, is that you can just back track to where they originate from....
Good luck!