Join Date: Jul 2006
Location: San Diego
Thanked 41 Times in 35 Posts
Rep Power: 10
I would start by cleaning the head of all dead sea critters that are under the bowl lip, rebuild head pump ( or replace head ) make sure tank vent is clear ( enlarging it also wouldn't hurt ) and use KO after every pump out.
If that don't stop it, check lines for permiation and replace as needed, then clean, scrub and flush the bilge
1955 Blanchard 51 Custom ( I got a woody )
Lord, give me coffee to change the things I can change and Rum to accept the things I can't