Nissan Technical Advisor 12/9/2010The fuel that goes inside the valve is in fluid state or just a fume? The only possible way the fuel (but impossible) can go inside or on top of the valve assembly is the PCV valve through its hose connecting to the intake manifold; or the leaking carburetor (if equipped) or fuel rail sits on top or side of the valve cover and the cover gasket is worn out already that allow seeping the fuel inside the valve cover.
Vikki 1/7/2011mine had bad injector seals and injectors were weaping fuel after turning vehicle off. I have a 1986 4cyl 1.8 and am trying to keep it going. It's great when it runs right. My 4th one since 1978.