Salem Grand Villa 408 Loft sewer gas issue
We are having issues with our Salem grand villa loft. We have this as a park model, we never pull it. We purchased it prand new October 2010, used it all summer 2012 (with quite a bit of problems) and this year have had a sew gas problem. It is hooked up to a 250 gallon tank in the ground. All tanks drain freely when drained, we have cleaned the tanks numerous times and have no idea what could be causing it. Anytime you flush the back toilet sewer gases fill the entire camper. We checked the black pips under the sinks and all seemed to check out fine, Any ideas???????