1998 Johnson 150 leaking 2 cycle oil from carbs

[Rogera63]

I have a 1998 Johnson 150 which is pouring 2 cycle oil from the carbs and the lower carbs are the worst. What is causing this problem?

[almosthere]

my 250 does the same thing,was told its probably check valve for vent.my tank holds pressure during hot weather.

[Rogera63]

That may be the problem. Yesterday I talked to a boat mechanic who told me the same thing.

[jatr24]

I have same problem with my 97 Johnson 200 ocean runner
today I took the oil hose off the motor because I was trying to replace my inline fuel filter and oil spilled out the whole time till I pluged it.
where is this valve and is it something I should be worried about
thank john

[Rogera63]

Mine does not have any kind of valve but has a hole in the center of the cap on the oil tank that lets the tank vent. I cleaned mine but it did not seem to be stopped up.