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Old 04-21-2014, 06:08 PM   #1
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What if I told you my Black Tank Does not have a vent?

Ok here goes

Two years ago I changed out my rv toilet to a higher profile ball type. Now ever since then the toilet needs to burp every time its used.

Now my sink in the kitchen has a dry vent in the kitchen cabinet and my bathroom cabinet has the same.

No roof vents on the roof at all for either gray or Black.

FYI No dry vent found in the bathroom or in the wall behind the toilet?

1) So my question has anyone installed a black tank vent?

2) And if so where does it need to be placed?

3) Can it be placed just below the toilet between the toilet and the tank perhaps in the riser?

Thanks in advance for your responses. JR
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Old 04-21-2014, 06:58 PM   #2
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Have you been on the roof to see for sure? You must have a roof vent unless a previous owner covered it up. Without a vent, when dumping the tank the suction would collapse the tank or create other issues. It could be disconnected at the tank, but standard is a 1 1/2" vent pipe from tank to roof. Without it, the inside of the RV would stink. The small 'cheater vents' at sinks are just to break siphon so traps don't empty, they aren't replacements for roof vent.
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Old 04-21-2014, 08:17 PM   #3
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You need a vent on gray and black tanks without vents when you dump it would suck the water out of the sink and shower traps. The next time the tanks are dumped stay inside and listen to the traps for any gurgling sounds while some one opens the valves. What ever you do do not vent the black or gray tanks inside the coach you will get sewer gas from the tanks inside your coach. You could call the coach manufacture to find out how the tanks are vented.
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Old 04-21-2014, 08:31 PM   #4
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Per RVIA standards, all recreational vehicles must have a vent for all holding tanks. The RVIA adopted NFPA standards as published in the Federal Register, and are thus law that must be followed. Now if your RV does not have the RVIA seal on it, it does not have to meet the legal standards.
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Old 04-22-2014, 10:32 AM   #5
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Everyone I agree I have never seen this either. But I have been on the roof for years and I have never see a single plumbing vent. Also I have been searching wall chases and back of the bathroom. I can not find a path or a vent anywhere? I am puzzled JR
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Old 04-22-2014, 05:08 PM   #6
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Hi jroethke,
Before you do anything, consider getting into the guts of the chassis so you can see the top of the black tank. Determine if you can see a pipe coming out of the top of the tank. I know this is a PITA, but it may save you
some heart ache.
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Old 04-22-2014, 06:59 PM   #7
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Phone or email Coachman (with your VIN and coach ID# in-hand) and ask where the black tank vent pipe is located. If they say there is none, ask why.
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Old 04-23-2014, 08:59 PM   #8
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Good point on calling coachman. They will probably be able to send you a PDF of the plumbing schematic from their archives. Each rig I have owned either had a copy of them or I got from the manufacturer for free. May as well get the wiring schematic while you are at it as well.
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Old 04-25-2014, 08:55 PM   #9
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If no tank vent, you can't put more waste water in (thus the toilet burping) and you can't get waste water out (the discharge line will glug repeatedly when dumping). Or maybe not sump at all after the first few gallons trickle out.
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