I think the forward cuddy drains to the bilge (bottom of the boat) and then runs down into fiberglassed pipe that carries water under the fuel tank. That is probably where the blockage is. not sure how 85 i/o is configured but if it is like mine I would try to snake from the aft end of the fuel tank and snake up.
__________________
1986 V-20
1986 Yamaha 150 HP
|