I'd use a fuel pressure gage and check correct fuel pressure. Once correct pressure builds up, see if pressure holds for a bit with everything off? If pressure drops like rock, you have a fuel pressure leak. Another thought would be evap leak?
How long since a tune-up? Any applicable trouble codes?
Try a new fuel filter...?
SOURCE: My 1993 240sx smells like
I am thinking that it may be your fuel injectors. You may have one gone bad or the O- rings may need replacing. At least that is what the gas smell was caused by my 1990 model.
SOURCE: 2001 Monte Carlo SS 92,000
No doubt valve seals,the oil gets burned so you usually can't see it.Normal for GM motors,actually the small amount of oil will help the longevity of the engine.They can be changed in a few hours but I would leave it alone.When they get really bad if the car sits and idles you will see some smoke. The seal is just a small o-ring ,they get brittle and fall off.The shop can use air pressure at the spark plug hole to keep the valve up,compress the valve spring and replace the seal.
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