The dreaded potty burp, can't eliminate it
Long time RV'r and have dealt with the potty burp before but this time I can't figure it out. Interestingly the pipe connecting the toilet to the tank would sometimes back up implying a 'pyramid'. I w...
Forum Discussion
To Wind Surfer, I have no idea what fitting was used to accept the usual 1.5" vent pipe so this may just be impossible but as diagnosed, the is a gas built up so it's not venting. If the fitting on the top of your black tank is a simple slip fitting without a stop, yes they do exist, the pipe may extend down into the tank instead of stopping inside the fitting.
This is just a guess. I am not a plumber and I have never bought the fittings but mine look like flanges, sealed to the top of the tank and screwed down. What I would do if it is a straight drop into the tank, is to extend a 3/4" or 1" measuring tape down into the vent pipe and try and hook the end on the bottom of the pipe. Record the measurement and then extend it fully into the tank and when it touches the bottom, record that measurement. Compare the two measurements. The answer should be obvious, if they are very close, it could be the rising water in the tank is sealing off the vent.
In atperci's problem, measurements are impossible because, from his description the vent is combined with his grey water tank. His easy test is to use a tapered sewer hose fitting to adapt the stinky slinky to the sewer line, adapt a wet dry vacuum hose to the fitting, place the tapered fitting in the drop hole in the toilet and attach the hose to the exhaust of the vac and turn it on. If the air from the vac flows out the vent, add say 5 gallons of water until it won't vent any more. This would give him an estimate of what the volume of his tank really is and show that the vent is working.
I would appreciate any feed back you might have if you try my ideas.
David
This is just a guess. I am not a plumber and I have never bought the fittings but mine look like flanges, sealed to the top of the tank and screwed down. What I would do if it is a straight drop into the tank, is to extend a 3/4" or 1" measuring tape down into the vent pipe and try and hook the end on the bottom of the pipe. Record the measurement and then extend it fully into the tank and when it touches the bottom, record that measurement. Compare the two measurements. The answer should be obvious, if they are very close, it could be the rising water in the tank is sealing off the vent.
In atperci's problem, measurements are impossible because, from his description the vent is combined with his grey water tank. His easy test is to use a tapered sewer hose fitting to adapt the stinky slinky to the sewer line, adapt a wet dry vacuum hose to the fitting, place the tapered fitting in the drop hole in the toilet and attach the hose to the exhaust of the vac and turn it on. If the air from the vac flows out the vent, add say 5 gallons of water until it won't vent any more. This would give him an estimate of what the volume of his tank really is and show that the vent is working.
I would appreciate any feed back you might have if you try my ideas.
David
