Interesting problem. Did you ever think about pulling a vacuum on the roof or
wherever it exits and working backward?
Sent from my iPhone
> On Nov 23, 2022, at 9:02 AM, Jim Franklin <jamesf@groupwbench.org> wrote:
>
> Apologies if I've asked this before, I can't find any emails from it. I
> rent a basement apartment with a sewage ejection pump. When the weather gets
> cold, it stinks, almost exclusively while I'm in the shower. After many
> investigations and lots of thought, I think there's a leak in the vent side.
> As the catchment tank fills up, the air above the liquid can't push the cold
> slug of air in the vent pipe, so it exits through the leak.
>
> A plumber has been here 3 times, and yesterday replaced the noisy and banging
> backflow prevention valve, but either he's a nancy boy who doesn't wnt to
> dive any further down the waste side, or is clueless, because his excuse is
> that it's very hard to diagnose odors. Or maybe he's doing it for free as a
> friend of the landlord and doesn't want to create an all day job he won't get
> paid for.
>
> I'd like send a large volume of visible air down the vent and see if it leaks
> out somewhere. I'm thinking I'd drill two small holes- one for a balloon
> which I'd inflate to seal the vent, and one below it for a smoke gun. Sound
> plausible? Better way to do this? Is there such a thing as a high volume
> smoke gun for consumer prices?
>
> I've tried soapy water and smoke sticks to look for escaping air, but it was
> inconclusive; I think I need positive pressure inside the system. I suppose I
> could install a coupler in the vent and use the compressor and aforementioned
> smoke sticks, but I'm looking for a better plan A.
>
> thanks,
> jim
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