You may have a gas leak, when it catches fire you can claim on insurance. :>D Don't drive cars where you can smell gasoline. Anyway, your code tells you the car is running lean so the ECM is dumping more fuel to compensate.
What is code P0174? The Diagnostic trouble code (DTC) P0174 indicates 'System Too Lean (Bank 2). ' The P0174 engine code indicates that the air-fuel ratio in your vehicle is too lean. Before the gas in your car can combust and power your vehicle, it must first combine with oxygen.
lots of videos here
https://www.google.com/search?q=2007+Ford+Taurus+P0174
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