Police responded to the 100 block of S. Andrews St. for a boat fire.
After fueling the boat at their dock, the owner of the watercraft attempted to start it, when it flashed over, burning the four occupants.
The occupants discharged the onboard fire extinguisher and extinguished the fire before the Lake Orion Village Fire Department arrived.
The owner and operator of the boat, a 75-year-old Orion Tonwship man, a 78-year-old Orion woman, a 56-year-old man from St. Petersburg, Florida, and a 49-year-old woman from Williamsburg, Virginia, all suffered first-degree burns to their feet and legs.
Despite being burned, all four of them refused medical attention.