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Have you checked for any leaks? Last time this happened on my b16 was because one of the O-rings on the injector went bad and when the car was running, there was gas pouring down the intake mani and the back of the head. I also noticed it from the strong smell that came inside of the car. Hope this helps somewhat
More info please...
Is the engine running differently/worse? Where do you smell the fuel the most? Under the hood? Any recent repairs? What year and engine?
If the smell is coming from beneath the car, you prolly need to put it up on jackstands and inspect the fuel lines for any damage. If those look good, inspect the vapor and fill tubes (where you put the gas in) to see if they are OK. The smell of the gas vapors should be able to point you close to where the leak is.