Jabsco Toilet Bowl Refilling

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dewent

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After flushing heads with many pumps of the handle to ensure the bowl is fully empty, within 10 minutes the bowl is half full again with discoloured water. If left it does not continue to fill just stays half full. Can anyone advise what the problem is and how to rectify?
 
Stork_III said:
Joker valve having a larf. It is not closing properly. Clean or renew.
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Probably the joker valve, but having been plagued by this problem I an tell you that replacing the valve may not fix it. Replacing the whole pump may not fix it either. Replacing the anti siphon valve may not fix it either.

You may find, as we did, that its just the outlet water flowing back down a section of pipe under the force of gravity. Keep pumping until you have clear water only and then just live with it.
 
I am by no means saying that Ex-Solent Boy is incorrect but in the dozen or so instances of this problem I have experienced, with three different boats and at least five different toilets, the problem has always been the joker valve. Sometimes it's only salts on the lips of the valve that prevent its closing, sometimes salts in the housing distort the valve so the lips don't meet properly, or sometimes the rubber has aged and the lips are apart at rest.
 
dewent said:
After flushing heads with many pumps of the handle to ensure the bowl is fully empty, within 10 minutes the bowl is half full again with discoloured water...
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Then you are not flushing enough. Do a test: put some washing-up liquid in the bowl, and count the pumps until you see bubbles: this is the minimum number of pumps.

You will always get a bit of water coming back, perhaps half a litre?
 
nigelmercier said:
Then you are not flushing enough. Do a test: put some washing-up liquid in the bowl, and count the pumps until you see bubbles: this is the minimum number of pumps.

You will always get a bit of water coming back, perhaps half a litre?
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On the heads I was referring to you could pump 100 times to clear the waste and then pump another hundred if you were bored to empty the pipes. Of course, after a few pumps you are just pumping air anyway. Despite all this, new pump, new valves, new anti siphon etc the water would still flow back down the pipe. Several engineers looked at it and concluded there was no solution.

I am just telling this story so the OP realises that whilst the joker is the likely culprit, it may not solve the problem.
 
Mine does that, never found a Joker valve thats 100% tight. Probally what is happening, especially if your discharge pipe rises abve sea level is that what is in the pipe draining back into the bowl, extra pump strokes will esure the water that does come back will be clean sea water. from you description I would suggest putting some food colouring into bowl, pump until visible, then double the number of strokes to ensure everything is well and truly gone.
 
Having had this very experience, I'd say definitely the joker valve and it is also worth the replacing the flappy valve thingie in the pump as well.
 
dewent said:
After flushing heads with many pumps of the handle to ensure the bowl is fully empty, within 10 minutes the bowl is half full again with discoloured water. If left it does not continue to fill just stays half full. Can anyone advise what the problem is and how to rectify?
Click to expand...

Oh its a joke replaci g the joker valve.... Usually get someone else to do it unless your the only crew then its a case of vinegar and water fill up the dank flush it out and close off the fresh water supply and power to the switches.
 
The joker valve assembly on my current toilet is very low, preventing me from sliding a suitable container beneath it before slowly undoing the screws. I do find that I can get a plastic bag underneath, which does almost as well. Install the bag, loosen the screws, catch the water that comes out. Then pull the housing away and gently release the joker valve, which will normally release the column of water that is in the loop. I can just about shuffle the bag full of water beneath the fitting on the toilet without spilling most of it. It is tempting to tip it down the toilet at this stage but temptation must be resisted!
 
Jabsco also do a Twist & Lock replacement unit for the manual pump. I replaced with this when the old pump came off in my hand (honest guv) last summer holiday whilst in Chichester Marina. On the basis of our boat practice with loos of the culprit providing the solution (stupid tradition in my view) I spent the day with my head down the bog whilst wife & kids went off to Chichester for the day, shopping. So I was dropped in it twice over! Have to say tho that the new unit has stopped the backfill problem.

http://www.yachtmailchandlery.com/jabsco-twist-n-lock-pump-assembly-complete/
 
Yep, Experiencing same symptoms. Twist'n'lock pump two years ago, service kit last year, backfilling again, following the boat being borrowed by my daughter's Uni sailing team. New joker valve purchased for fitting by the skipper (SWMBO). Glad it's not me!
 
vyv_cox said:
The joker valve assembly on my current toilet is very low, preventing me from sliding a suitable container beneath it before slowly undoing the screws. I do find that I can get a plastic bag underneath, which does almost as well. Install the bag, loosen the screws, catch the water that comes out. Then pull the housing away and gently release the joker valve, which will normally release the column of water that is in the loop. I can just about shuffle the bag full of water beneath the fitting on the toilet without spilling most of it. It is tempting to tip it down the toilet at this stage but temptation must be resisted!
Click to expand...

I've just replaced the joker valve to cure the same problem (it worked BTW) but couldn't get anything under the the valve assembly to catch the @@@@. A Pela pump inserted in the top of the loop (assuming you have some form of siphon arrangement) came in very handy!
 
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