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Doral
 BoatUS Boat Groups/Manufacturer Forums>>Doral
Subject Topic: bad smell when flushing vacuflush Post ReplyPost New Topic
 
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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: September 18 2006 at 10:07 | IP Logged Quote Ernesto

This weekend we noticed a bad smell on our cabin after every time we flushed our vacuflush head. I looked at the holding tank and the hoses and couldn't find any leaks, although I haven't thoroughly inspected everything. The tank was pretty full though, like 3/4 or so.

What I did was I got the tank pumped-out and flushed some fresh water with the sealand tank deodorized per the instructions.

However, still after doing this every time I flushed we got a bad smell in the cabin (even as I was now flushing sealand deodorizer with fresh water) - my wife smelled it even sitting on the cockpit settee as the cabin door was open. You can definitely smell it in the bilge area below the steps.

Any ideas of what I should be checking and in what order? For now I'm making the head off-limits



Edited by ruizsantana on September 18 2006 at 11:39
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Herk
"Seaman Recruit"




Joined: July 28 2006
Posts: 4
Posted: September 18 2006 at 11:10 | IP Logged Quote Herk

Every boat I've been on in my life, including our current Doral 270sc will have an unbearable smell at anything over 3/4 full.  When running it comes up the vent line in heavy seas, when pumping into it too it forecs the foul air out the vent line.   YOU WILL SMELL IT EVERYWHERE.

Running in 3+' seas will send that yuck slopping everywhere in the tank (look near your vent after you run and you'll see what came out the vent line...ewww).

Perhaps some waste is now stuck in the vent line?  You may want to try forcing some water down the vent line.  Or next pump out over fill your waste tank with water to flush out the vent line.

I do this about once a year to make sure there aren't little pieces of well crap stuck in the vent.

P.S.  When you aren't running, and sitting at dock or for the week (always leave some water in the head).  Keeps waste tank air from coming back up!

What I've always done at dock pump bowl 1/4 full, switch to drain and it seals bowl from tank.  WHen I get to the boat or am going out, make sure to pump the water out of the bowl or it will obviously slosh everywhere!  Otherwise if you have a full waste tank it could seap back to the bowl due to pressure from the tank and when you get to the boat after a week you may have a nasty surprise waiting for you in the head.

Hope this helps.

Herk

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womsterr
"Seaman Recruit"




Joined: August 05 2002
Posts: 32
Posted: September 18 2006 at 22:15 | IP Logged Quote womsterr

Try flushing down your vent line. It could be stopped up or have some crud in there.

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2000 Doral 360SE
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TerryW
"Seaman Recruit"




Joined: July 18 2006
Posts: 23
Posted: September 19 2006 at 04:22 | IP Logged Quote TerryW

Something that may be worth checking is the pressure relief valve on the top of the holding tank. Unfortunately, US boats have much smaller vent pipes than European boats. When you use the pump out stations it is possible for them, when the tank is empty, to pull more air than the vent will allow in, thus causing a vacuum in the tank, which in turn causes the pressure valve to pop open. If this valve does not re-seat when the pump out is disconnected, you will have an open vent into the boat. I leave the rest to your own imagination.
I have only had this problem once, and that was caused by the only time one of my boats was emptied using pump out, as I always use the mascerator.

Terry



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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: September 19 2006 at 09:21 | IP Logged Quote Ernesto

Thanks all,

Let's see if I can find exactly which one of the through hulls is the waste vent. I'll get panicked about putting water down the wrong one!

Oh, and the waste vent filter, you know it's location? How is it changed? Also, do you know where I can buy a replacement, or do they have to be ordered directly?

Terry - will I recognize the pressure relief valve? This is the first time I'll be messing around with the waste system. I doubt what you described is the case as the boat had not been pumped out for a while when this suddenly started happening... but it's worth checking.

So, if there's a clog in the vent line or the filter is bad, would the air be let into the boat throught the valve that Terry described?

 



Edited by ruizsantana on September 19 2006 at 09:23
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Herk
"Seaman Recruit"




Joined: July 28 2006
Posts: 4
Posted: September 19 2006 at 09:48 | IP Logged Quote Herk

HA That one's easy....Just go back and stick your face right by each one and sniff while your wife pumps out the head!

You might want some goggles just in case.

Herk

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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: September 19 2006 at 09:58 | IP Logged Quote Ernesto

 LOL!!! 

I'll see if I can have a defibrillator at hand too.



Edited by ruizsantana on September 19 2006 at 10:01
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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: September 24 2006 at 22:38 | IP Logged Quote Ernesto

Update:

I couldn't find an air leak anywhere....
When I flush no significant amount of air comes out the vent through-
hull... It could not be felt... Is this normal? As the head was flushed I
stuck my hand to the hole (outside the hull) and my hand smelled
bad afterwards... so some air must be coming out but very litte or
very slowly, not enough to be felt. Does little air coming out sound
like a jam to you?

As to the vent hose - it is quite small and transparent. I didn't see
anything stuck on it... It does go down and through a limberhole and
then back up a few feet to the through hull, so I couldn't see all of it.

The through hull fitting seems to be designed not to let much water
in... I tried the suggestion above of trying to put water into it, and the
water leaked right into be bilge. The leak happened right on the
inside of the through hull, where the hose is connected to the fitting.
This is in the engine compartment over the starboard fuel tank.

Last thing, I didn't see any filters there... what would the filter look
like if it is installed? Would it be inside the hose itself?

It'd be hard to believe though that the bad smell in the cabin comes
from the through hull, as that is in the engine compartment. Even
with the cabin closed we immediately feel a bad smell right after
flushing... so some air must be escaping somewhere...

I also didn't see the pressure release valve on the tank...

If anyone has any more feedback please help!
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GeorgianCruiser
"Seaman Recruit"




Joined: January 24 2006
Posts: 1
Posted: December 22 2006 at 18:50 | IP Logged Quote GeorgianCruiser

Ruiz,

I have the same boat you do and actually had the exact same problem.

I followed my vent line back from the through hull on the starboard side as far as I could and found that it had gotten pinched behind a piece of plywood that was being used to mount hoses to.  Although it had probably been pinched since new we never really noticed the smell untill we let the tank get pretty full.

After fixing the pinch and installing a vent filter (for good measure) we have never had a problem.

Vent filters very in size but ours is roughly a 3.5" by 10" cylinder.

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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: December 22 2006 at 20:57 | IP Logged Quote Ernesto

Thanks GC... The smell has died down after pumping out and using
deodorizing crystals, but I'm not convinced that the vent line is working
properly... I'll try to check it thoroughly like you did...

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NHDoral
"Seaman Recruit"




Joined: November 02 2005
Posts: 91
Posted: December 23 2006 at 00:36 | IP Logged Quote NHDoral

Do you have the charcoal vent filter inline?




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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: December 26 2006 at 11:49 | IP Logged Quote Ernesto

Not that I could find...

 

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NHDoral
"Seaman Recruit"




Joined: November 02 2005
Posts: 91
Posted: December 26 2006 at 15:19 | IP Logged Quote NHDoral

Look under the bed in the aft cabin. DO you have an inspection hatch? If so open it up. You may find what your looking for. Also throw a tablespoon of pine sol down there or soe orange bilge cleaner.

Cheers Pal!
Will


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Ernesto
"Seaman Recruit"




Joined: March 22 2006
Posts: 99
Posted: January 05 2007 at 16:05 | IP Logged Quote Ernesto

Yes I've looked down there, no obvious signs of there being anything wrong...  I think I will try to disconnect the vent line and blow compressed air through it to see if it's not a bit clogged...

Again the smell is only immediately after flushing and it lingers for a few minutes, so I must think a bit of air is escaping somewhere...

 

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