Dickybeau Posted June 19, 2019 Share Posted June 19, 2019 I’m in darkest France. My water pump has begun to work intermittently with taps full on in either hit or cold! If I turn toilet and sink tap on it runs smoothly. This is a new phenomenon. The pump is a replacement for the original Bürstner fitnent a year ago. Any clues about why this has happened? I live in Scotland and don’t usually have lime scale. I’ve been away in France since June 1 so I’m not sure I’d expect rapid clogging from limescale in that time frame particularly if I used campsites 50% of the time. I understand that Shurflo have replaceable diaphragms. Is this a likely cause? Link to comment Share on other sites More sharing options...
Guest pelmetman Posted June 19, 2019 Share Posted June 19, 2019 Airlock in the kitchen department ;-) ...... Just run both taps full blast usually sorts it :D ....... Although you prolly have one of those fancy mixer taps :-S ........ So try left and then right :-> ....... Link to comment Share on other sites More sharing options...
teccer1234 Posted June 19, 2019 Share Posted June 19, 2019 on my sureflo pump there's an adjustable screw in the center for the diaphram, I had to screw mine in because it was stopping intermittedly maybe that's the problem Link to comment Share on other sites More sharing options...
Dickybeau Posted June 20, 2019 Author Share Posted June 20, 2019 The pump sits vertically in the base of a seat. I’ll repeat my air bleeding system with the taps but the screw thing will need to wait until I can drain the system and remove the pump I think. Thanks for your ideas Link to comment Share on other sites More sharing options...
Guest pelmetman Posted June 20, 2019 Share Posted June 20, 2019 Cant see it being the screw thing if the bathroom tap works fine? :-S ........ Link to comment Share on other sites More sharing options...
teccer1234 Posted June 20, 2019 Share Posted June 20, 2019 nothing to do with the bathroom tap , it's all to do with pressure, op said with all taps running it's ok, so no pressure buildup, only 1 tap running more pressure, I know because I had excatly the same problem and the screw solved it right away Link to comment Share on other sites More sharing options...
Derek Uzzell Posted June 20, 2019 Share Posted June 20, 2019 I don’t have a clear mental picture of the problem, but this earlier discussion may be worth reading. https://forums.outandaboutlive.co.uk/forums/Motorhomes/Hints-and-Tips/sureflo-water-pump/38884/ Link to comment Share on other sites More sharing options...
Robinhood Posted June 20, 2019 Share Posted June 20, 2019 The adjustment screw on the pump adjusts the switching point of the integral pressure-switch. The switch is operated by a diaphragm, one side of which is the (pressurised) water, and the other is the plunger for the switch. As the pressure rises (e.g. when the taps are closed) , the plunger is pushed and the pump is switched off. When the taps are opened, there is a drop in pressure, the plunger is released and the pump switches on. If the pump does not respond quickly when a tap is opened, then there is certainly a possibility that the screw needs adjusting (likewise, if the pump does not turn off quickly, but runs on). There is a sweet-spot on the adjustment such that a drop in pressure immediately switches the pump on, and a rise in pressure rapidly turns the pump off. Over-adjustment is likely to cause the reverse problem, so a search for a reasonable central point is important. This all assumes that the water system is (only) pressure switched, which most Shurflo installations are. If the pump is energised by microswitched taps (or alternatively, by a hybrid microswitch/pressure system as I had on a Hobby), then there could be issues with microswitches at the taps. Link to comment Share on other sites More sharing options...
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