Waterpump problem - air going into inline filter after tap shut off (1 Viewer)

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ajsingerty

Free Member
Mar 24, 2023
3
1
Funster No
94,782
MH
Carthago A class
After I shut off my taps air is getting into my fresh water system. This causes the pump to come on after a while. I cannot find any leaks from the pipework. So I checked the pump and can hear a slight noise like air passing through a small gap. Also I can see air appearing in the in-line filter, through the transparent casing. What do I do? Is it likely to be a waterpump fault? Why don't I see water escaping if there is air getting in?
 
Jan 29, 2017
703
577
Gloucestershire
Funster No
47,109
MH
Lunar Champ H621
Exp
15yrs
Greetings and welcome!
Is this a shurflo type pressure pump? Ie a tubular motor with a plastic top and both pipes on opposite sides.
Is it controlled by a pressure sensing switch or by switches in the taps?
If its pressure sensing(uses a microswitch mounted at the top of the pump) then it's quite likely to try to keep up a pressure when there is no demand. Also they can leak internally backwards thru the seals giving the same effect.
Could the air you can see be air that was dissolved in the water?
Hope this helps
Mike
 
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ajsingerty

Free Member
Mar 24, 2023
3
1
Funster No
94,782
MH
Carthago A class
Yes, it's a Lilie Shurflo. Pressure sensor on the pump. Too much air to just be in the water. I think it's the pump leaking because of very quiet hiss it makes when the pump stops. I bemused by the lack of any water escaping. I also noticed that when the water tank is full air doesn't get in so quickly as when the tank is empty. Come that be the draw back to the tank caused by gravity? More draw when tank is empty means more suck.
 
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Apr 22, 2018
7,093
13,025
Herts.
Funster No
53,503
MH
Adria Coral lowline
Are you sure the clear bowl of the filter isn’t cracked, allowing the pump to suck the air in. Hence the no water leaking out as it is on the low pressure, suck side of the pump.
 
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Jan 11, 2022
795
721
Funster No
86,220
MH
Pilote P732 2011
Exp
3rd Time around, since 2000
Are you sure the clear bowl of the filter isn’t cracked, allowing the pump to suck the air in. Hence the no water leaking out as it is on the low pressure, suck side of the pump.
More than likely, bit like older diesel not starting due to sucking air

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ajsingerty

Free Member
Mar 24, 2023
3
1
Funster No
94,782
MH
Carthago A class
I have checked it, couldn't see any cracks but I have ordered a new one, will try it. Thanks for your thoughts.
 
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