Onboard 2 stroke oii tank overfilling

[wildcatt]

I have a 88 Excel 2.6L - 225
intermittently the onboard tank will keep filling - past the upper level indicator. I've changed the gasket on the sensor, as I thought that might be cause. Seems to make no difference?
Any ideas?
What does that gasket do inside the small tank

[boats.net]

Could be a bad sensor in engine oil tank or a bad oil module. Test the sensor first.

[wildcatt]

Noticed last night - when this occurs, there is a ton of smoke.

Is the engine getting more oil than required when the tank is being overfilled?

Can this harm the engine?

thx

[boats.net]

The vent hose for engine oil tank is connected to air silencer on front of carbs, when it starts the engine will pull that oil into intake. It's not a real danger to engine could cause some plug fouling.