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Old 04-22-2018, 11:18 PM   #1
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Strange thing with waste system

All,

At the marina, I was having a pump out and when I opened the opening to the pump out and the contents were under pressure and exploded out of the pump out tube throwing bad stuff over me and half of the boat.

Now, not sure what happened nor why. Doing the Loop and had the waste pumped out 7 days ago, which should have been fine with a 53 gal tank. Been than long before without issues.

Any ideas?
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Old 04-22-2018, 11:25 PM   #2
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It sounds to me that the vent is plugged and causing the tank to pressurize.
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Old 04-22-2018, 11:29 PM   #3
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+1 on the vent being plugged. Do you have a filter in the vent?
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Old 04-22-2018, 11:36 PM   #4
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Mud wasp nest up the vent outlet
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Old 04-23-2018, 12:02 PM   #5
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What they said.
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Old 04-23-2018, 12:14 PM   #6
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Sounds logical, thanks. Now, does anyone if the vent cap can be unscrewed or does one have to take the hose off at the other end and blow it out with air?

Typical vent:
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Old 04-23-2018, 12:28 PM   #7
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Should be on the outside of the hull right in line with the pump out hose/cap.
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Old 04-23-2018, 12:36 PM   #8
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Sounds logical, thanks. Now, does anyone know where the vent is on a 400 Mainship? Thanks


It will be the opening on the side of the hull that isnít anything else. You will have vents for your fuel tanks and water tank. Eliminate those and the other vent will be your holding tank vent.

You should also be able to see the vent hose on your tank and see which direction it is going. The vent will likely be on the side of the there. In my limited experience, the holding tank vent is usually near the pump-out opening. So if your pump-out opening in on your deck, look to the side of the hull below the pump out.

This is one of the reasons I like to pump-out my own holding tanks. I will always back flush the vent line when pumping out the holding tank. I pump out, then fill up the holding tank at least half full and pump out again. Iíll do a second rinse as well and this time while the tank is being pumped I will direct a stream of water over the tank vent. This gets sucked back into the tank, flushing the vent line to help keep it clear.

We donít seem to have problems with wasps building nests in the vent line in the PNW so I canít offer any suggestions there.
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Old 04-23-2018, 01:54 PM   #9
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Thx for all the good info. Will try to force water thru the vent opening and see it that clears it. If not, suspect that I'd have to disconnect by the tank and flush out with air or water the other direction.

Other ideas?
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Old 04-23-2018, 02:00 PM   #10
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when my diesel vent was stopped up, I removed the line from the through hull and cleaned the blockage in the fitting from inside .the line was fine
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Old 04-23-2018, 02:05 PM   #11
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Thx for all the good info. Will try to force water thru the vent opening and see it that clears it. If not, suspect that I'd have to disconnect by the tank and flush out with air or water the other direction.

Other ideas?


Long flexible wire?
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Old 04-23-2018, 02:07 PM   #12
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If you have a tank vent in-line filter, check that it is not clogged. You may need to replace this. It should be in the vent line, just before it exits the hull. If you have one, you will not be able to back-flush your vent line as this will clog up the filter.
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Old 04-23-2018, 02:15 PM   #13
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I used a cut-off Harbor Freight sink router. To avoid any similar results to your pump-out fiasco, Iíd use caution with air pressure or suction, especially if the tank is not clean. Methane can ignite in a shop vac, so Iíve been told.
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Old 04-23-2018, 05:43 PM   #14
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If you have a tank vent in-line filter, check that it is not clogged. You may need to replace this. It should be in the vent line, just before it exits the hull. If you have one, you will not be able to back-flush your vent line as this will clog up the filter.
I would suggest that if the OP has a vent filter, he remove it. The need for a vent filter can be eliminated by proper maintenance of your holding tank. Plus, they prevent the back flushing of the vent line.
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Old 04-23-2018, 05:49 PM   #15
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The vent LINE is rarely if ever blocked...unless it's clogged filter in the line-which happens when the tank overflows or you try to backflush the vent line--blockages almost always occur in the thru-hull and/or at the connection to the tank--both the vent fitting on the tank and that end of the vent line. So use a screwdriver, ice pick or whatever works to scrape out the thru-hull...knock out any screen, screens cause more problems they solve or prevent. Now that the pressure has been relieved, remove the vent line from the tank and scrape out the tank fitting and that end of the vent line.

You might also consider checking out the link in my signature...it goes to a comprehensive "marine toilets and holding tanks 101" manual that will help you learn how to prevent problems instead of having to solve 'em.

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Old 04-23-2018, 06:02 PM   #16
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The vent LINE is rarely if ever blocked...unless it's clogged filter in the line-which happens when the tank overflows or you try to backflush the vent line--blockages almost always occur in the thru-hull and/or at the connection to the tank--both the vent fitting on the tank and that end of the vent line. So use a screwdriver, ice pick or whatever works to scrape out the thru-hull...knock out any screen, screens cause more problems they solve or prevent. Now that the pressure has been relieved, remove the vent line from the tank and scrape out the tank fitting and that end of the vent line.

You might also consider checking out the link in my signature...it goes to a comprehensive "marine toilets and holding tanks 101" manual that will help you learn how to prevent problems instead of having to solve 'em.
Ahhh, but for the simplicity of a urine separating, desiccating head
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Old 04-23-2018, 06:11 PM   #17
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Ahhh, but for the simplicity of a urine separating, desiccating head

Exactly. Are you going to try one ?
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Old 04-23-2018, 06:22 PM   #18
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Quote:
Originally Posted by HeadMistress View Post
The vent LINE is rarely if ever blocked...unless it's clogged filter in the line-which happens when the tank overflows or you try to backflush the vent line--blockages almost always occur in the thru-hull and/or at the connection to the tank--both the vent fitting on the tank and that end of the vent line.
I want to be sure I understand Peggie. Are you saying that normal backflushing of the vent line can cause a blockage or that trying to backflush an existing blockage that is at the thru-hull?
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Old 04-23-2018, 06:27 PM   #19
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Why don't they offer a urinal for guys on boats? It would save a lot of water and plumbing aboard. There are even waterless ones, although I think you have to replace other stuff regularly to keep it from stinking...
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Old 04-23-2018, 06:35 PM   #20
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Why don't they offer a urinal for guys on boats? It would save a lot of water and plumbing aboard. There are even waterless ones, although I think you have to replace other stuff regularly to keep it from stinking...

We have a urinal on our boat some otheres call it the duck board
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