Jabsco loo: raw water inflow lever seems to block pump

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BelleSerene

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Jabsco heads with the usual manual pump: lever to the left to pull in seawater and pump; to the right to just pump. Holding tank. Seacock on fat bottom (sorry) pipe out to the deep blue.

Recently when the lever is to the left and you pump, it builds up pressure in one or two pumps and then jams. I can't figure out why. With the lever to the right, the pump sucks the bowl out just fine.

I believe this happened just after I'd been dried out against a harbour wall for a couple of tides and had closed the seacock under the holding tank for the duration so as not to decorate the hard standing. I re-opened the seacock out at sea and the holding tank does not appear to be full at all. Don't know whether drying out or having closed the seacock has anything to do with the problem - somehow doubt it.

Is some brighter spark able to suggest what the problem might be please?
 
BelleSerene said:
Jabsco heads with the usual manual pump: lever to the left to pull in seawater and pump; to the right to just pump. Holding tank. Seacock on fat bottom (sorry) pipe out to the deep blue.

Recently when the lever is to the left and you pump, it builds up pressure in one or two pumps and then jams. I can't figure out why. With the lever to the right, the pump sucks the bowl out just fine.

I believe this happened just after I'd been dried out against a harbour wall for a couple of tides and had closed the seacock under the holding tank for the duration so as not to decorate the hard standing. I re-opened the seacock out at sea and the holding tank does not appear to be full at all. Don't know whether drying out or having closed the seacock has anything to do with the problem - somehow doubt it.

Is some brighter spark able to suggest what the problem might be please?
Click to expand...

Had a similar problem after being out of the water - Had unscrew where the lever is, back fill it with water and that solved the issue.
 
A bit strange. The usual problem is with pumping on the 'dry' side, when failure to push the lever fully across can lead to failure to operate.
 
WF36 said:
Had a similar problem after being out of the water - Had unscrew where the lever is, back fill it with water and that solved the issue.
Click to expand...


Thank you. Can you suggest where please? - at the bottom of the pump where the hose goes in? Presumably if I do this while afloat, if I leave that inlet seacock open it’ll fill itself with sea water and if it doesn’t theremyst be a blockage in the inlet pipe as someone else has suggested?
 
BelleSerene said:
Thank you. Can you suggest where please? - at the bottom of the pump where the hose goes in? Presumably if I do this while afloat, if I leave that inlet seacock open it’ll fill itself with sea water and if it doesn’t theremyst be a blockage in the inlet pipe as someone else has suggested?
Click to expand...

You may find one or two of the videos on the Jabsco Technical Help website useful

http://jabscotech.com/


This one, which explains how the pump on manual toilets works iswell worth watching to begin with

 
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RichardS said:
Indeed. your inlet seacock is closed or the thru hull is blocked with mud or weed or something.

Richard
Click to expand...

Interestingly I had a Jabsco T&L malfunction and not want to pump anything anywhere in addition to having the pump handle stick up and hold loads of pressure. It was all odd (and many details forgotten).

Turned out the rubber flap valve at the top of the pump body had a piece of seaweed stuck in it, preventing correct operation. Removing th seaweed soon returned it to normal operation and service.

So, whatever gender you may be, check your pumpin' flaps...
 
I had a similar problem after replacing my pump assembly.
Worked ok with lever to one side but moving lever across to other side it would build up back pressure on pumping or work for a few strokes ok then build up back pressure.
On close inspection and putting hand pressure on leaver it worked ok, I reckon that it is a design change problem.
The block on the valve cover (item 27) that limits its radius of travel of the lever (item 23) is too limiting.
By shaving a mil or two off the edge of the block on the valve cover to increase the levers radius of travel by about one degree solved the problem.
 
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