303463 PH side hose is listed as oil return it serves to send puddled crankcase oil juices back up to the top bearing for oil…
you can replace with proper sized hose… some use clear fuel hose to see oil working itself back up the top under crankcase and vacum pulsing of the crankcase
to service your oldy download this 400 + page book
https://watercraftmanuals.com/outboard/johnson/manuals/johnson-302231.htm
Joining AOMCI has priviledges 🙂
