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Q: gas smell in Xterra on 2003 Nissan Xterra

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I have a gas smell inside and outside the car when driving. It seems to be coming from engine are - can find no leaks, split hoses, etc. Was told it could be fuel injector - is it dangerous to drive? Also told it could be catalytic converter. Can not find a diagram of where fuel injectors are located but after going over the engine a couple of times, do not see any evidence of gas leaking.
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