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Old 23-07-2018, 07:07   #1
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Sealand Vacuflush not flushing

Hi all,
I am somewhat new to the boating world and very new to the vacuflush systems. My system has been constantly running. Which, from my reading here is probably an air leak somewhere. Now, the toilet will not flush. Nothing will,go down. The owners manual said the first thing to do was use a plunger. Didn’t work.

Any other suggestions? Thanks in advance.

Scott
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Old 23-07-2018, 08:20   #2
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Re: Sealand Vacuflush not flushing

It may or may not be an air leak or a clog....in fact, may not even be a problem with the toilet, but a blocked holding tank vent that's pressurized the whole system, creating back pressure that won't let anything go down.



I've emailed you the info you requested along with the trouble-shooting guide. If you can't find the solution in any of it, I'll be glad to help you.


--Peggie
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Old 23-07-2018, 09:04   #3
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Re: Sealand Vacuflush not flushing

Thanks! I should have mentioned I have a 2nd head and that one flushes just fine.
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Old 23-07-2018, 09:11   #4
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Re: Sealand Vacuflush not flushing

The second head is on its own vacuum generator.

First step is to examine the hoses from the head to the tank. You might be able to hear the leak.

Second is to replace the duckbill valves in the vacuum generator. There are 4 and they are sold in kits of 2. (BTW the pump-out pump only uses 2 duckbill valves)

You might as well replace all 6 duckbill valves in your system while you are at it.

Do place some disposable pads under the generators when you open them up..... And wear clothes that you do not mind getting soiled.

Just did this on my system. Expect $22 for a set of 2 valves - Shop around for the best price.
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Old 23-07-2018, 09:51   #5
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Re: Sealand Vacuflush not flushing

Quote:
Originally Posted by Gregorys6601 View Post
Hi all,

I am somewhat new to the boating world and very new to the vacuflush systems. My system has been constantly running. Which, from my reading here is probably an air leak somewhere. Now, the toilet will not flush. Nothing will,go down. The owners manual said the first thing to do was use a plunger. Didn’t work.



Any other suggestions? Thanks in advance.



Scott


the system is not design to constantly run... you have an seal problem probably at the toilet.
does the toilet hold water or does it slowly go away.
when you use the toilet, you need to fill the bowl with water and press the pedal until you hear that the pipe is free.
did you use it this way? if not, you blocked it... more than likely at the vacuum tank.
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Old 23-07-2018, 10:28   #6
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Re: Sealand Vacuflush not flushing

The bowl does hold water. Probably have not held the foot pedal down long enough at all times. Didnt know I needed too. Can I use a snake for the 4 ft to the vacuum or should I disconnect the hoses? Of course, I have about two feet to work in after crawling in a small space I barely fit into!
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Old 23-07-2018, 10:46   #7
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Re: Sealand Vacuflush not flushing

The bowl holds water so the seal in the bowl works. You should hold the foot lever down for 2 or 3 seconds when flushing to move the stuff through the lines.

That the vacuum generator runs full time then we can conclude that no vacuum is being created or the pressure switch is bad. That you cannot flush means no vacuum and not the switch.

No vacuum means that there is either a leak in the plumbing or there is a leak in the vacuum generator.

The duckbill valves commonly "wear out" after some years in the generator. And are the most common cause of a failure to generate a vacuum (when there is no leak in the plumbing).
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Old 23-07-2018, 11:14   #8
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Re: Sealand Vacuflush not flushing

Thank you. Once I figure out which model I have I am going to order the duckbill replacement parts. Is there a generic or Sealand instructions somewhere for replacing these parts?
THanks!
Scott
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Old 23-07-2018, 11:26   #9
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Re: Sealand Vacuflush not flushing

A quick google search of: "sealand duckbill valve installation" will get you instructions and videos.

Not hard to do. Just unscrew - you may need a set of channel locks (I did).


Don't forget that Westmarine does a price match. WM often has at least 1 set in-stock.
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Old 24-07-2018, 08:20   #10
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Re: Sealand Vacuflush not flushing

keep it simple - don't flush - pump it out.
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Old 24-07-2018, 08:27   #11
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Re: Sealand Vacuflush not flushing

Quote:
Originally Posted by moseriw View Post
keep it simple - don't flush - pump it out.
Flushing the toilet itself. I pump out the holding tank and don't flush into the water - I have no overboard flush for the holding tank.
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Old 24-07-2018, 09:13   #12
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Re: Sealand Vacuflush not flushing

Be aware that when replacing the duckbills, one side of the pump may have LH threads, if you cannot get it to move, try the other direction
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Old 24-07-2018, 09:47   #13
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Re: Sealand Vacuflush not flushing

If running constant, check the bellows piston at the Vac Generator. If broken, it will run but not create vacuum.
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Old 02-08-2018, 18:23   #14
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Re: Sealand Vacuflush not flushing

Thanks all. It was the duck bills. Rep”aced and working perfectly. Thank you everyone for the info and advice!
Scott
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