FELLSMERE — Two vehicles collided and flipped northbound on Interstate 95 at mile marker 157 just outside Fellsmere Sunday afternoon. All seven passengers refused transportation for treatment, according to authorities.The Florida Highway Patrol was called out to the scene around 4:30 p.m. and found two vehicles and a boat overturned. The boat was leaking fuel, which authorities said was “substantial” but less than 10 gallons. The fuel leak was eventually stopped.The vehicle types, type of boat and ages of the people involved in the wreck were not immediately known.Traffic was not impacted, according to FHP.