Jabsco Twist & Lock Toilet

[VicS]

Contrary to above advice you're most likely to find it's the rubber valve item 21 in the above diagram.

We had exactly this problem last year, and the rubber flap with the metal weight on it has a pressed on grip washer which had come off and was preventing the port from sealing. This was preventing suction when the handle was pumped, so the bowl wouldn't empty.

The giveaway is that the pump plunger feels effortless, like you're just pumping air, it just gurgles but doesn't do anything. It feels like it's lost its prime, and is air-locked.

Thankfully this is a much cleaner, easier and quicker problem to fix than the joker valve which I had feared was the problem.

Just remove the top screws and check the gasket is seating properly over the two ports. You have to be quite careful when reassembling. If necessary, replace the rubber flap valve / gasket.

Unfortunately Jabsco don't sell this rubber part as a single item, it only comes as part of a repair kit.

Just to clarify, one of the valves is the flush water, the other is the pump suction. The lever just blocks off the flush water to provide suction only when required.

Sorry I dont see how #21 has any bearing on the pump out. It is just a gasket that carries the valves for the pumping in part of the process.

BTW #21 is listed as a separately available part cost £4.71

 

[Trundlebug]

The lever doesn't in any way control the pumpout suction. The pumpout system is constantly in operation, and is affected only by the sealing ability of the base valve, the joker valve and (to some extent) the piston. With a new toilet, the piston won't be worn, so it's logical to assume that the fault lies with the sealing of the base valve or the joker valve. If your piston was worn and wasn't sealing properly, it could have given the symptom you describe.

I've just remembered, you're quite right.
It was the flushing water that wasn't coming through and was just gurgling / pumping air.
The bowl was emptying OK.

My mistake, please disregard my earlier post!

I've had that many problems with toilets on holiday they all roll into one. It's my worst nightmare! Got to confess it's been generally better with the Jabsco than the earlier Dutch Raske & Meyde (?) but every time it gets used I dread the worried look on people's faces when they come out and the shake of the head that signifies the horrible task ahead...

 

[pvb]

You're right, the lever doesn't control the pumpout suction, but the valve does.

The valve definitely doesn't control the pumpout suction. If you were a practical type, you'd be able to tell that by looking at the exploded diagram posted earlier.