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Old 03-06-2016, 10:03 AM   #1
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No functional roof vent on black tank?

there are two small vents on the roof, but i had long been suspecting that they were deaf ears, as i had never smelled bad odor from there. finally i proved it yesterday, in an unpleasant way.

at a dump station, after emptied the black tank, i was adding water through the rinse port. in about 10 minutes, i heard a whistle sound from the restroom. i went and noticed air bubbles arising from the bottom of standing water in the toilet. without thought much, i stepped on the release lever. boom! the water was splashing out. what a mess!! i spent hours to mop again and again wherever it could reach. fortunately while being unfortunate, at least it was NOT yellowish

the pressure built up to that high tells me that the vent was totally sealed/blocked. it couldn't be true that an object was dropped into the vent to have that effect. what could it be? i suspect the tank maker had never punched through the wall at the port (similarly the punch you would need to do on a kitchen waste disposer when you install it) and the installer in cc didn't bother to look at it.

from the upper access door in the hurricane heater compartment, i saw a 1.5" dia. black rubber hose clamped on to a terminal on the top surface at the corner of the black tank. i will try to disconnect the hose and check if there is a hole in it. i don't see a hose for grey tank from that access though.

what do you think? any experience or comments?
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Old 03-06-2016, 10:37 AM   #2
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Quote:
Originally Posted by CountryFit View Post
i was adding water through the rinse port. in about 10 minutes, i heard a whistle sound from the restroom. i went and noticed air bubbles arising from the bottom of standing water in the toilet. without thought much, i stepped on the level. boom! the water was splashing out. what a mess!! i spent hours to mop again and again wherever it could reach. not too bad, at least it was NOT yellowish
what do you think? any experience or comments?
CountryFit
I suspect you DO have a working black tank roof vent.

I also suspect that you completely filled the tank when you added water for 10 minutes through the rinse port without leaving the black tank drain valve open...(and that if you had allowed it to fill for another few minutes it would have spewed out of the black tank roof vent).

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Old 03-06-2016, 10:40 AM   #3
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If your vent wasn't working, your black tank odors would have nowhere to go except into your cabin. I'm sure you would have smelled that.
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Old 03-06-2016, 11:07 AM   #4
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making sense...

a small addition - the water in toilet didn't arise up at the time. shouldn't water have been up instead of just air bubbles? when i pressed the lever, there was not much water, but burst of pressured air and some water brought up from the pool.
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Old 03-06-2016, 10:31 PM   #5
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If I had been drinking coffee when I first read this, I'd have it coming out my nose Actually, I have a friend that did the very same thing only had some brown stuff hit him in the face.

The tanks, when get full can expand some and hold more than rated capacity. The roof vent won't come into play until the tank gets completely full and then you will get the stuff coming out the roof vent. Had a friend, who has since passed away,that ran the brown down his emerald green awning doing exactly what you did.
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Old 03-06-2016, 10:53 PM   #6
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GO up on roof with a garden hose
Remove black tank vent cap (don't which one it is...remove both)
Push end of hose down into vent line as far as you can
Open black tank drain valve
Turn water on to hose and blast vent line
Watch for water running out of black tank drain

Toilet down pipe goes from toilet to black tank....via it's own opening in top of tank
Vent line pipe goes from roof to black tank.....via it's own opening in top of tank

When you OVERFILLED the black tank using the flusher system w/o having drain valve open water level trapped air in the toilet down pipe until you opened the toilet flush ball/blade.

Bet you don't find vent line obstructed because you would have problems draining black tank due to no venting action --------draining would be very slow, draining would be sporadic (gulp, gulp, gulp) or would start to drain and then stop.
As water drains out air has to come in otherwise it creates a vacuum

Don't run flush system with tank drain valve closed..end of problem
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Old 03-07-2016, 10:20 AM   #7
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now you made me clear what happened...

in the past after black dump i normally refilled to "full" then opened the valve to let out. that day. i was distracted by other things and didn't noticed it past the "full" for a while. apparently the water in the black tank trapped the air inside the toilet pipe (the big one) and continued to rise compressing the air, but it had not arisen to the ball level yet, maybe close... ah, you guys rock!!

lesson is learned. never never ever again
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