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Old 06-07-2020, 03:45 PM   #15
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Could also be a vent pipe not doing its job. With no air going into the tank, no liquids will come out, or if they do it is a small amount.

Some RV had a vent pipe installed so it sticks down into the tank. When the liquid level reached the bottom of the vent pipe it blocks any air from coming into the tank.
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Old 06-07-2020, 03:52 PM   #16
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When the RV manufactures install the tanks and drill the holes for connections they sometimes leave the drilled hole piece in the tank where it can easily block the drain connection when dumping. Moving the RV moves the plug allowing it to drain correctly until next time it moves into the wrong place.
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Old 06-08-2020, 10:02 AM   #17
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Thank you all for the valued input! I was thinking that some type of debris could be in the gray tank, knowing how quick these things are slapped together. We make sure that no food products or grease goes down the drain. I was only adding 5 gal of water to the black tank before we headed out, I think I will add 10 - 15 instead.

Again, thank you all!
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Old 06-08-2020, 12:04 PM   #18
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Have you ever drained the tank, closed it then added a measured amount of water,then drained it into the same container and see what you get out? This may be something as simple as your gauge is not accurate/telling the truth, which is a very common thing.
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Old 06-08-2020, 04:01 PM   #19
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Originally Posted by 4GsCampinFam View Post
When we were out on our last trip had a couple of minor tank draining issues. So the gray tank was almost full and wouldn’t drain when my wife opened the valve. She said it drained normal for a few seconds the went to a trickle. I shot water up the drain pipe to flush it out. Then the day we left the black tank wouldn’t drain past 1/3 tank. After driving home I went to a local trailer dump and the black tank drained with no other issues. Also flushed it out with no other issues.

My question is this..... Other than using product in the black tank during use is there anything you fellow RVers use to keep your tanks clean and flowing problem free?

I do add 5gal of water and product to black before we leave. Giving the chemical a good chance to mix up and just incase anyone needs a quick restroom stop along the way. Is there anything like this I should be doing to the gray tank?
How do you know the black tank would not drain down past 1/3? If you are counting on the level reading gauges working, advice is "don't" These things are notorious for not working correctly. You will figure out when the need to dump by the sounds the tanks make. Gray tanks will gurgle in another sink/shower. Black tanks will burp from the toilet.
Do not count on the gauges working, they will stop.

Get one of these so you can prevent any surprises and you can back flush to clean the tanks.
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Old 06-09-2020, 01:11 PM   #20
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This reminded me of this. I had a friend that got a new TT, and soon after, asked me about the black tank possibly might not be emptying all the way. He used it two or three times and the gauge seemed to go to full right away.

I told him the led gauges are never accurate, and to dump it on the next trip, giving it plenty of time to be sure it stopped draining.

Then get it home, pour a measured amount of water like 4 gallons into the potty, then go outside and drain it into a 5 gallon bucket and see if he gets the same amount out.

He did this and got out only a gallon. Then looked in and saw a green thing. After a few hours of wondering what it could be, his wife finally came clean and admitted to dropping the laundry detergent cap into the potty, and didn't want to reach in and get it so she just stepped on the pedal and said her goodbye's. She just thought it was going away like it might be going away at home.

He had to disassemble the drain valve to get it out, which was a messy job. Thankfully, I was only lending advice, not a hand.
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black tank, maintenance, tank

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