I had a similar but completely opposite situation on a WaveRunner, Search ding dong took the Waverunner out and stopped at a Marina and pump gas into the oil tank.
Immediately realize what he did called home where we were. I drove back slowly and we pulled it up on the dry dock. Change the fuel filter, the oil filter, bled all the lines flush them out Refule refill the oil . A little bit of butter and a minute or two later papa papa papa Started running just like it was. Now I don't know how that's going to help you but there is hope.