[shawn30]

I have twin 2001 Mercury 150 EFI Saltwater engines on my boat. On the starboard motor, oil seems to leak slowly from a 3 way brass fitting under the reservoir oil tank on the engine. The fitting has a hose that goes to the tank, another hose that goes to the motor and the third end has nothing on it. This is where the oil is leaking from. The other motor has the same fitting with the open end, but no oil leaks from this one. Anyone have an idea on why this is happening. Thanks for any help.

[gss036]

The oil is coming from the/through 2 psi check valve (3 way valve you are referring to) and they do leak. I just replaced mine this past year. Cheap and easy fix.
I think there is about 4-5 five of them on the engine at various location in the fuel oil system.

[shawn30]

Thanks gss036. I will replace it asap..