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Old 12-04-2012, 10:06 PM   #1
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Toilet blowback

I have a 2010 Cardinal 3625 , when I flush the toilet it has like a blowback presure. I checked the vents anyone have any suggestions on whats going on.
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Old 12-04-2012, 11:04 PM   #2
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I can't think what else would cause the tank to become pressurized other than a blocked vent pipe. Have you had the vent cap off and shone a flashlight down the vent?

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Old 12-04-2012, 11:33 PM   #3
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I looked down the pipe but didnt shine a light
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Old 12-05-2012, 07:58 AM   #4
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Originally Posted by cjoel View Post
I looked down the pipe but didnt shine a light
Is your ceiling vent fan on when this happens?


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Old 12-05-2012, 08:05 AM   #5
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Are you talking about a "burp" from the holding tank or the pressure of the water coming out of the toilet when you flush it?
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Old 12-05-2012, 11:14 AM   #6
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Quote:
Originally Posted by cjoel View Post
I have a 2010 Cardinal 3625 , when I flush the toilet it has like a blowback presure. I checked the vents anyone have any suggestions on whats going on.
If you are talking about the tank seeming to be pressurized I had this same problem about a year and a half ago. First off remove the vent cap and make sure the vent is not blocked. You can do this by opening the black tank drain valve, insert a water hose and see if water flows out the drain. Be careful, if the vent is blocked you may get wet. If you are not able to use the water method you can insert a long piece of romex into the vent line to insure the line is not blocked. I believe my problem was that I was not using the geo method frequently enough thus allowing some waste to remain in the tank and partially block the vent. Hope this helps.
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Old 12-05-2012, 12:04 PM   #7
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I have a 2010 Cardinal 3625 , when I flush the toilet it has like a blowback presure. I checked the vents anyone have any suggestions on whats going on.
One cause for this has happened before, the roof vent extends too far into the tank. If the level reaches 1/3 or whatever the vent is now sealed off. Normal air can no longer escape up the pipe. Just normal warming of the coach during a sunny day will be enough to begin pressure in all tanks if not vented. One way to check is to fish the vent from the roof on the low side of the coach. use a l braket on the end of your line and try to catch the side of the pipe where its open to the tank. Mark your line carefully with a reference line. Compare over the side of the camper to the main floor level, the tank should begin just below. If the meaurments indcate the pipe is longer than the floor its submersing early in use.
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Old 12-05-2012, 01:11 PM   #8
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Old 12-05-2012, 05:00 PM   #9
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I'll get a toilet burb when I'm very close to full capacity with the black tank, once I empty a portion, burb goes away...if that's your problem.
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Old 12-06-2012, 12:17 AM   #10
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Is your ceiling vent fan on when this happens?


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