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Old 11-02-2013, 04:48 PM   #1
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Pressured black tank????

We have been camping for 2 weeks in our new 2014 Flagstaff 5th wheel in Arizona. When we flush the toilet there seems to be pressure in the black tank as the water kinda burps in the bowl as the flap opens to drain the toilet. This happens anytime one flushes......any ideas?
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Old 11-02-2013, 04:52 PM   #2
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I wonder if it is not venting?

Any cover on the roof/birds nest??
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Old 11-02-2013, 04:56 PM   #3
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Originally Posted by cdnwillyg View Post
We have been camping for 2 weeks in our new 2014 Flagstaff 5th wheel in Arizona. When we flush the toilet there seems to be pressure in the black tank as the water kinda burps in the bowl as the flap opens to drain the toilet. This happens anytime one flushes......any ideas?
You might want to get on the roof and remove the vent cover and measure down to the bottom of the black tank and then the length of the vent tube. Should be at least 5"-6" difference IMO. Vent could have been installed too low in the tank and needs pulling up.
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Old 11-02-2013, 05:32 PM   #4
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A 2014 should not have a wasp nest in the vent, but it is possible I suppose.

The vent pipe might also have broken its glue seam (or was never glued) and slipped into the tank. This needs to go back to the dealer (IMO).
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Old 11-03-2013, 09:30 AM   #5
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More info: Went on the roof and it all looks good no nests/blockage. Went and removed the cap on the water wash for the black tank and then flushed toilet, burped once then was good after that when flushing. I did hear sound like something let loose after the first flush. Closed and closed cap thinking all would be good. For about 10 flushes no burping, now this morning same burping after each flush.
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Old 11-03-2013, 09:35 AM   #6
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How long since you've dumped the tank?
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Old 11-03-2013, 09:41 AM   #7
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Sure sounds like the vent pipe is too far down in the tank, by taking the cap off of the black tank rinse you allowed more air in which points to the vent pipe being the problem.
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Old 11-03-2013, 10:04 AM   #8
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Black Tank

Check to see if the drop tube from the toilet is to close to the bottom of the tank. The next time you dump the tank and the water is disconnected open the valve and measure from the tank bottom to the valve opening. Use a flashlight to be sure you are at the bottom. The pipe may be to close and causing a back up of air as the unit flushes. I am assuming the toilet is a direct drop to the tank and not piped at an angle. Frank
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Old 11-03-2013, 10:25 AM   #9
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Open the black tank drain and put a water hose in the appropriate vent on top of the TT.....turn on the water and observe flowage...
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Old 11-03-2013, 10:33 AM   #10
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Open the black tank drain and put a water hose in the appropriate vent on top of the TT.....turn on the water and observe flowage...
Make SURE the hose has a shutoff at YOUR end of the hose!

If the vent fills in only seconds, the vent is blocked. Push the hose down until it stops and try to blast out the obstruction.

If the vent starts filling after only a few minutes, the pipe may have been installed too low in the tank.
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