Question: We have a 2000 Gulf Stream Palm Breeze. When the wind blows a certain way we get a horrible sewer smell in the storage compartments of our coach. It permeates the inside of the coach. We have changed the valves under both sinks and have check the vent on the roof. We seem to only get this smell when the wind blows. Help please.
Answer: A difficult thing to figure out, but we will venture a guess that perhaps there is a break in one of your vent pipes that run from the black or grew water tank up to the roof. If there is a break anywhere along the pipe that could cause the leakage of sewer gasses up into the interior of your RV.
Another possible source are your p-traps, so make sure that you clean them out periodically; use any biodegradable enzyme to break down bacteria and solids . Also, try to keep the p-traps full of water while moving and when stationary. We also recommend that you keep your dump valves closed to further prevent sewer gasses from entering through the dump valves while connected to a sewer connection.
If anyone has any further thoughts on this please provide input.