I recently purchased a 1991 Gibson 50' Houseboat (offically referred to as a 'Cabin Yacht').



I visited the boat several times prior to purchase and didn't notice
any problem smells (of course the boat was open and aired out when
these visits took place).



Now I notice that when it is closed up a substantial 'waste like' smell
seems to be present. I can usuall get it out by opening all the windows
and airing things out. Also, it seems like the smell comes through the
airconditioner vent in the stateroom.



From what I've read in this forum, it sounds like I need to replace the
waste lines and possibly the tank itself (it is aluminum).



I should also note that the boat sat for several months with a very
full holding tank. I pumped it out and rinsed it 3 times, but that
didn't solve the odor problem.



I'd appreciate any comments or possible other solutions. If the
replacement is my only option, does anyone have a feel for an
approximate cost?



Thanks.