Should Not...
Guts althought you were not Catalina specific in your question I can offer the following based upon my experience with my own Catalinas and sailing on many others and other brands....After owning a 1988 C27 for many years with an inboard diesel and now a C34 MKII I have not experianced diesel fumes in or around the boat. Yes, there could be a slight hint of diesel in the engine compartment while the engine is running and for a short time after shutdown but you would really have to be looking, "smelling" for it. Sooo, to answer your quetion.. No Catalina's do not have a problem with diesel fumes. Other modern day boats should not have a problem either assuming all functions are operating normally.Enjoy!