Jabsco manual toilet - problem pumping out only

check the vent at the top of the outlet hose, it gets blocked with toilet paper and other items this is the normal blockage which cases your particular problem.

Once unblocked the toilet will work fine, if not then the fault is now in the pump section after attempting to force it to work against a blocked hose. Buy a complete pump and a service kit, that way you can have a spare pump waiting in the wings ready to swap if/when required, when it gets blocked again. Its a common fault.
 
Thanks for the suggestions. Finally made it down to the boat this evening for an hour or so: Checked the joker - not inverted.
Seacock - Fine -when outlet pie disconnected sea water flowed in happily.
Outlet Pipe - free from blockages.
Reassembled and then managed to invert the joker with sufficient pumping, disconnected pump unit - base valve gasket quite clogged up. Reassembled again. still not fixed.

Will now follow the suggestion of replacing the pump and then servicing the old one and keeping a spare. Assuming this solves the problem. Incidentally, I have noticed that after several pumps the 'pump in' also become next to impossible.

Re the previous post. The pipework appears to have no Vents at all.
 
Re the previous post. The pipework appears to have no Vents at all.
Click to expand...

If fitted near or below heeled water line vented loops should be fitted in both inlet and outlet pipework so that there is no risk of syphoning if the seacocks are not closed. Note that the vented loop on the inlet replaces the direct connection normally supplied between the pump and the bowl. It does not go between the seacock and the pump.
When fitted well above the heeled water line the vented loop in the inlet is not required (but a nrv can be fitted to maintain the pump prime). It is optional in the outlet. Fitting one will ensure that you can keep some water in the bowl.

I imagine that the modern twist and lock pumps to some extent reduce the need for a vented loop in the outlet.

See operating and installation instructions
 
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Having fitted the new pump the problem continued. I checked the outlet pipe again and found that there was indeed a significant build up of limescale which had moved down the pipe and was now near the seacock end! Despite having checked a few days ago it was indeed blocked. At least I now have a new pump that won't need a service this season. Thanks for all the suggestions - will invest in some vinegar.
 
sperata said:
Having fitted the new pump the problem continued. I checked the outlet pipe again and found that there was indeed a significant build up of limescale which had moved down the pipe and was now near the seacock end! Despite having checked a few days ago it was indeed blocked. At least I now have a new pump that won't need a service this season. Thanks for all the suggestions - will invest in some vinegar.
Click to expand...

Try Hydrochloric acid, or brick cleaner - you need something stronger than vinegar.
 
>will invest in some vinegar.

That won't work. The free way to do it is bang the hose hard on the edge of the pontoon it loosens all the calcium which falls out. If you want to use a chemical do not use neat Hydrochloric acid it is lethal. Use Muriatic acid which 20% Hydrochloric acid and 80% water, don't mix it youself. You will need a lot of it - we bang it on the pontoon.
 
>Junk the whole thing and get a Lavac!

All marine toilets that are flushed with salt water will get Calcium pipe blockages eventually. If you haven't got one yet you haven't used it for long enough. From maintenance experience the number of flushes before Calcium blockage is c.2,190 equivalent to six flushes every day for a year.
 
I am using some stuff from Leesan ( Leescale) which is a regular treatment to keep scale levels down and this has been pretty successful so far. We have had our Lavac six years now and I generally dismantle it every other year for a good scrape out and valve/diaphragm inspection. Diverter valves are usually the worst afflicted with scale.
 
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