fuel in oil in leg and coming out of the exhaust

[Shane McConnachy]

I have a 3 yr old 60 HP 4 stroke Yamaha, I just came in from fishing and it used 3 times the amount of fuel, fuel and oil are all over the prop and bottom of the leg, when I started it you can see water and fuel coming out of the exhaust in the prop and the engine stinks like fuel. When I took the engine cover off I pulled out the rubber plug for the oil in the leg, oil squirted out of the leg and it smells like fuel.

Can someone please tell me whats going on?

[99yam40]

When I took the engine cover off I pulled out the rubber plug for the oil in the leg, oil squirted out of the leg and it smells like fuel.

I had no idea Yamaha ever used a rubber plug to hold the lube in the lower unit, are you sure about that?
All lower units I ever saw used screws with gasket/seal for drain and vent.
Is the oil level OK on motor or is it over full and dumping?

[Shane McConnachy]

Sorry, the plug is the Oil dip stick and the engine oil is over full, it squirts out

[99yam40]

maybe fuel pump is bad and dumping fuel into crank case,
not sure if 4 strokes can do that but it is a thought

Injector stuck open is another

[rodbolt17]

I have seen both.
a stuck open injector can case it, but the motor will run like crap.

a bad lift pump diaphragm will cause this with no other symptoms.

a leaking VST needle valve can do it as well.