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A sewage pump in my basement is 7 feet from the shower drain and 2 feet from the water closet. The only vent is from the sump pump which runs 20 feet horizontally to an outer wall then goes vertically till it stops just below the soffit on the ground floor. Toilet never flushed properly so what must be done, now that I have the bathroom ready for total refurbishing? The shower waste is 2" and 36" from trap to an el that drops below concrete right near the lav's vertical drain which ends in the concrete into what might be an 1.5" trap. They may join under the concrete then go to the sump. I looked down the closet drain, all I see is a 3" el with no connections. Funny thing is, the closet drain is pointed 90 degrees away from the sump? The toilet is not clogged, I used to work with a plumber so I know about the holes you speak of. The vent may be the problem. It's 2" and rises into the joists, runs 3 els and I think goes as I stated. I was wondering if I might cut the vent near the joists, reinstall the john and flush it and see if it works. It's is gravity operated. The vent isn't code if it's not through the roof and I'm not so sure that long a horizontal run makes a good vent. We want to sell the house so we need to be up to code and functional. I was thinking of attempting to run a 1.5" vent through the roof if my experiment works. What do you think?

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Is this a pump flush toilet or the more common gravity flush? –  Chris Cudmore Sep 19 '13 at 13:44
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We need detailed information on the drain and vent configuration to speculate on what the problem may be. If the plumbing is properly configured, the toilet may be defective. More than once I've encountered bowls where 1 or 2 rim holes were filled with glaze where the toilets sort of worked but sometimes not and never well. –  bcworkz Sep 19 '13 at 20:40
    
I don't believe a near horizontal vent is an issue as long as there's enough of a slope to drain any moisture (rain) and not form some type of trap that blocks airflow. Beyond that, air will flow fairly easily any direction you turn it. The main concern is how far from the toilet trap is the vent connection. If you don't know that and can't figure it out, then I'd recommend getting a plumber with an inspection camera they can send down the drain. –  BMitch Sep 22 '13 at 1:34
    
If your current vent doesn't go out the roof, and you're not using an AAV, that's bad. An open vent inside your home is allowing methane gas from the sewer system to get into your home. In addition to smelling bad, it's highly flammable. –  BMitch Sep 22 '13 at 1:35
    
The toilet trap is 12" from the sump basin and the vent on the sump is the only one for the toilet, is it vented? –  Les Sep 23 '13 at 9:18
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