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Old 17-06-2016, 13:47   #16
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Re: Strong Back Pressure in the Head

Recently had the same issue. Removed hose connecting head to yvalve. Cleaned out and reassembled. Taking hose off a the yvalve the outflow dlhad reduced in size about 75%. Google problem and took Don Casey's advice and after pumping 1/2 cup of miriactic acid twice in between flushing with fresh water it was clean. Follow Don's instructions and it should work. Beats a yucky job of dismantling system. Good luck
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Old 17-06-2016, 13:57   #17
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Re: Strong Back Pressure in the Head

Back pressure can sometimes be misinterpreted when the actual event is a vacuum caused by no entry from the inlet hose. I would be sure to check that the inlet through hull is open and clear. Sucking up some debris into the intake hose and intake blockage can cause these symptoms that you're describing.
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Old 17-06-2016, 14:07   #18
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Re: Strong Back Pressure in the Head

Try some salad oil down the toilet. Things might be "jammed".
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Old 17-06-2016, 14:16   #19
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Smile Re: Strong Back Pressure in the Head

Take two aspirin - call me inthe morning. I don't make house calls -just kidding!
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Old 17-06-2016, 15:22   #20
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Re: Strong Back Pressure in the Head

Guess people didn't read the post that said the problem was solved.

I've had the same problem lots of times due to operator error. It has always been that I didn't fully move the lever over to wet bowl position.
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Old 17-06-2016, 16:58   #21
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Re: Strong Back Pressure in the Head

I agree with Hudson Force. We have had a similar problem, and it is when I have forgotten to open the seacock that lets the flushing water in. That is, it is an inlet problem, and not the outlet. Rod.
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Old 17-06-2016, 17:57   #22
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Re: Strong Back Pressure in the Head

Was cruising with a buddy a few years ago in the PNW. He had his wife and one of her g/f's and I had my significant other aboard. His head was getting harder and harder to pump so they periodically came aboard our boat to use our head.
We anchored one afternoon and he attacked his head problem with both his ladies having pumped until they could not get the handle to move! He had a go with pumping while the four of us relaxed with drinks on my boat. There was a strange sound like a small explosion came from below decks on his boat and he appeared covered in waste with a used tampon in his hand and walk directly off his boat into the ocean. The back pressure caused by all the pumping had blown the waste disposal line off the toilet and the residual waste and tampon which had plugged it covered his whole upper body!
Needless to say, we had a serious discussion about nothing going down the head on either boat unless it was first eaten. After cleaning up, he reconnected the waste hose and tried pumping water through it and it worked fine.
I recall asking if anything foreign had found its way into our head but was admonished by my significant other that it was an inappropriate thing to ask our guests. I said, "... Fine, if our head plugs, you clean it"! End of discussion! Phil
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Old 17-06-2016, 19:36   #23
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Re: Strong Back Pressure in the Head

Does ANYbody ever read ANY of the previous replies to an OP's question before posting their own "diagnoses and solutions???"
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Old 17-06-2016, 20:29   #24
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Re: Strong Back Pressure in the Head

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Originally Posted by peghall View Post
Does ANYbody ever read ANY of the previous replies to an OP's question before posting their own "diagnoses and solutions???"
Peggy,

I am sure I am not alone when I thank you (and the other experienced sailors) for taking the time to offer good troubleshooting tips and advice.

Thanks you!

And I think you have earned another feather in your angel wings.
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Old 17-06-2016, 21:22   #25
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Re: Strong Back Pressure in the Head

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Originally Posted by Steady Hand View Post
Peggy,



I am sure I am not alone when I thank you (and the other experienced sailors) for taking the time to offer good troubleshooting tips and advice.



Thanks you!



And I think you have earned another feather in your angel wings.

👍


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Old 17-06-2016, 21:39   #26
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Re: Strong Back Pressure in the Head

Thank you both for the kind thoughts!
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Old 17-06-2016, 22:05   #27
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Re: Strong Back Pressure in the Head

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Originally Posted by double u View Post
some of those gaskets/valves have been known to be assembled the wrong way round during "maintenance"...
Yup, did that, have a tee shirt. A very different feel from either a clogged vent or line.
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Old 17-06-2016, 23:42   #28
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Re: Strong Back Pressure in the Head

Had the same thing. Opened the stop cocks finally and voila it worked again
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Old 18-06-2016, 05:49   #29
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Re: Strong Back Pressure in the Head

I appreciate the cautions to read the thread before postings solutions, but the original poster with the head problem has not responded since post #3. Despite my own agreement with the good advice for solving the problem, we haven't heard that the problem has been solved.

Oh, sorry Peggy! I found it , "He went shopping for a new pump after I talked to him..."

Well, at least I can hold to the excuse that it was a little obscure. I do too much "scanning"!
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Old 18-06-2016, 07:35   #30
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Re: Strong Back Pressure in the Head

recently experienced this. changed out ALL sani hoses and no more problem.
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