+1 on the splashing. We have a 15hp Yam 4 stroke
with the same configuration. An ocassional cleaning
and a bit of petro jelly. The color could be protectorant.
We spray down engine components with heavy silicone. Some use T9 but its messier come service
time. Neither seemed to keep the fuel pump
clean from splashing.
If your worried about function you can remove the carb hose and check the pump
flow into a glass. If you open the case it may not reseal.
A manual is a very good thing for novice
and expert tinkerer.