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Here you go! Ford Maverick vs. Nissan Patrol: Mercury Villager vs. Nissan Quest vs. Guangdong Bus Works vs. Nissan Pathfinder:

You could pull the spark plugs and see if one looks richer than the rest (darker soot deposits or, in an extreme case, wet gas), but if it was leaking that much I think you'd be chasing symptoms other than a fuel smell in the oil. IIRC the injector rail and injectors come out together (been a while since I had my intake off); if this is the case, you could run the fuel pump with the injectors where you can see them and look for which one is dribbling (or just pull the upper intake, run the pump, and see if you smell fuel from one of the runners). You might get away with just cleaning the injectors. I haven't had to try that myself but it sounds like there's not much to it. If you do have to replace one or more, check the color of dot on the injectors (under where the electrical plug goes IIRC). Should be black or blue, and ideally you want the same dot color on your replacement(s). That said, my '93 has five of one and one of the other (was like that when I got it) and it doesn't seem to mind. Again, though, do the fuel pressure test first to be sure you're not chasing ghosts. Also, are you sniffing the leak or the dipstick? If the dipstick smells like oil, there's gas in your oil--if it smells like gas underneath, but not on the dipstick, something else is leaking.