hi, i wrote this once and then didnt finish it.
my vent pipe for the septic tank goes up through my closet behind a wood/laminate box cover.
i checked mine for cracks etc and nothing.
the smell was only in the closet and only when driving. the venturi cover over the vent pipe that sticks up through the roof faces forward so when you drive, the small hole in the front makes the air flow faster going out the back and causes a vacuum to suck the fumes out of the septic tank.
since the silicone around the vent pipe at the outside roof under the venturi cover had totally dried up, there was a gap where the venturi vacuumed stink got shoved out the rear hole of the cover AND pushed down through the gap through the roof into the closet.
so, i took the roof venturi cover off (a bunch of screws) and carefully pryed the cover off (it was sealed with butyl putty) and cleaned the old silicone off. then i shot silicone down the gap, and re siliconed it several times over a couple of days. then used some new butyl putty tape and put the old venturi cover back on.
there are new ones that spin, etc, but this one is fine.
no problems since.
tom
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