I just bought a 1988 Ranger 350V from a friend of mine. It has 3 tanks and the fuel valve doesn’t tell which tank is which. Does anyone else have one with 3 tanks and could help. I can’t seem to figure out which tank I’m using when I select one. Thanks in advance 

Does it have the selection valve under the seat or on the transom? I’ve had a 374v with 3 tanks and the under seat valve went starboard or 9 o’clock for under the drivers seat, port or 3 o’clock for under the passenger seat and straight up 12 o’clock for the rear tank.