I recently bought a pontoon with a 1987 40 hp Evinrude. It isn't running well - seems to be running lean. I removed the air intake shroud and discovered a hose connected to a nipple at the very bottom of the intake manifold. The other end of the hose is connected to nothing. I put the end of the hose in a cup of fuel and turned the flywheel by hand and the hose blows bubbles or sucks fuel depending where the piston stroke is. I don't see anywhere this hose should be connected.
Any ideas what its purpose is? I'm sure it is the cause of the lean run.
Any ideas what its purpose is? I'm sure it is the cause of the lean run.