Captain Allen
Member
- Feb 2, 2009
- 356
- Boat Info
- 370 EC 1994
- Engines
- 454 Mercruisers, straight drives
My holding tank has hit the 3/4 mark over winter and I can't reason that it has been from use. Is it possible that the o-ring on the cap has gone bad and it is leaking rain water and washdown water into the tank? Anyone had this happen?