I think we are getting lost here.
BassHog has an Evinrude 2 stroke, the Yamaha mentioned is a 4stroke, there are no lifters on 2 strokes, the boat he has doesn’t have a portable fuel tank, but a built in, so there is no problem with venting.
I would say fuel pump, and have compression checked, if 1 or 2 cylinders are bad, it will start and idle rough.