I have a 1998 Yamaha 150hp with a oil lube tank. The tank has three areas for conections one is for the motor and the other is for the external oil tank pump. What is the third for? Can I just plug the third connection at the top of the tank because it leaks oil. Currently I have the external tank feed on the bottom connection. The other connection on the bottom goes to the motor. But I have no idea what the top connection is for?
