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Old 12-10-2019, 07:44 PM   #1
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Grey tank not draining

When i first started draining the grey tank it would drain just fine, just as it was about done the tank would "gurgle" or "burp" and then more would come out and stop.
Now the tank dont do that. Even though i cant hear anything else draining it don't "burp or gurgle". The monitor keeps reading either 33 or 66% full.
Any idea??? Air in the tank or what
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Old 12-10-2019, 07:56 PM   #2
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Originally Posted by DonB2 View Post
When i first started draining the grey tank it would drain just fine, just as it was about done the tank would "gurgle" or "burp" and then more would come out and stop.
Now the tank dont do that. Even though i cant hear anything else draining it don't "burp or gurgle". The monitor keeps reading either 33 or 66% full.
Any idea??? Air in the tank or what
Well it could be empty and the sensors are just reading erroneously. Pretty common especially with the older probe type sensors.
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Old 12-10-2019, 08:08 PM   #3
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I would assume the roof vent is plugged. If you have an old garden hose, run it down the vent pipe with a slow water flow until it hits bottom. If the pipe fills with water the pipe is blocked.
Have a helper turn on water flow full-blast while you seal the hose in the pipe with a rag, it might blow the blockage out, and/or get you soaked.
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Old 12-10-2019, 08:22 PM   #4
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Or the dreaded pyramids
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Old 12-10-2019, 08:45 PM   #5
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Or the dreaded pyramids
In the gray tank ?
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Old 12-10-2019, 09:56 PM   #6
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Roof vent for grey tank????
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Old 12-11-2019, 07:48 AM   #7
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Roof vent for grey tank????
Your RV doesn't have one? How does it drain without sucking the P traps empty?
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Old 12-11-2019, 07:57 AM   #8
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Perhaps a piece of construction debris trapped in there somewhere?

Though my FIRST thought was incorrect readings from the sensors. To prove/disprove that theory get yourself a 5 gallon bucket and see how many gallons of water it takes to fill the gray tank after you empty it. Knowing that, and of course the size of your gray tank, will tell you if it's sensors or not emptying correctly.
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Old 12-11-2019, 10:04 AM   #9
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Originally Posted by DonB2 View Post
When i first started draining the grey tank it would drain just fine, just as it was about done the tank would "gurgle" or "burp" and then more would come out and stop.
Now the tank dont do that. Even though i cant hear anything else draining it don't "burp or gurgle". The monitor keeps reading either 33 or 66% full.
Any idea??? Air in the tank or what
I would guess the sensors are not being accurate. Mine sometimes gives false readings just after dumping. I just learned the tank and how long things go until needing to dump. May read partly full at the beginning but takes a long time to actually show full.
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Old 12-11-2019, 11:57 AM   #10
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To the OP. Yes, roof vent for the grey tank as well as the black. Standard requirement for certified RVs like yours. Additionally, there are auxiliary air valves, inside the coach, that are placed after the p-traps for the galley and vanity. These allow air into the drain line and prevent any vacuum from the flowing water from pulling out the water barrier in the p-trap.


I agree with others that your issue is likely the sensors, which are notoriously inaccurate. Additionally, the presence of construction debris--specifically some of the cut-out discs from the holes for the pipes in the tank top-- finding its way to the drain opening is not unknown either. I really don't think you have a vent pipe clog as the tank would drain slowly for the entire time, not just a "burp" at the end, and you still have several openings for air into the tank from the auxiliary air valves, as mentioned.


If this was my issue, I'd check the amount of water that actually drains from the tank, as suggested. If the tank is, in fact draining completely, "burp" or no burp, then you have a sensor issue. The fact that you get readings of 33% and 66% when the tank is "empty" is also an indication of a faulty sensor. There may even be "gunk" build up on the walls of the tank that affect the sensor readings.


If you find your tank is actually not fully draining, I would then look at the possibility of debris working it's way to the drain opening and preventing a complete emptying.
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Old 12-11-2019, 12:25 PM   #11
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Your RV doesn't have one? How does it drain without sucking the P traps empty?
I don't have a grey tank roof vent.
I guess one trap will empty when draining. but never had an issue.
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Old 12-11-2019, 12:30 PM   #12
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Squeeze a bunch of dawn down the bathroom sink.
Then You can fill the grey tank in the shower with a garden hose. It's the lowest of the drains. When the shower starts to flood stop the hose(obviously) you should get foam first from soap. Drive around a bit then drain the tank. Should clear up anything in there and get a solid drain because tank is full.

Also if you know how to adjust your sensors. You can during this point as well.
Then you know your tank is full.
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Old 12-11-2019, 01:12 PM   #13
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I don't have a grey tank roof vent.
I guess one trap will empty when draining. but never had an issue.
Your grey tank has to vent to function properly. If may be tied into the black tank vent but it vents somehow.
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Old 12-11-2019, 11:11 PM   #14
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Most likely just the sensor. When done emptying the gray tank, set a pail under the drain, open the valve. Nothing should happen. Pour a couple gal of water in the shower or kitchen sink. Presuming it comes through to the pail, blame the sensor.
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