Pump runs on after tap closed

[acropolis22]

Just started doing this for some reason. Everything seems normal, water flow is fine, pump does not kick in at all when taps are all off. But after running a tap, the pump takes longer than it used to to switch off. I'd say it runs on for 3 or 4 seconds. Not a big deal unless it's heading for a problem. Any ideas? Should I be worried?

 

[bells67]

Just started doing this for some reason. Everything seems normal, water flow is fine, pump does not kick in at all when taps are all off. But after running a tap, the pump takes longer than it used to to switch off. I'd say it runs on for 3 or 4 seconds. Not a big deal unless it's heading for a problem. Any ideas? Should I be worried?

Do you have an expansion vessel ? If so there’s a valve on top try putting some more air in , if you find the make and model you can see the correct psi it needs

 

[tonyidle]

Assuming pressure switched it sounds normal to me.

 

[dunnah01]

Sounds like air in the system. Check the pipes and filter on the supply to the pump

 

[acropolis22]

Sounds like air in the system. Check the pipes and filter on the supply to the pump

Is there a simple way to purge air without taking everything apart?

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[dunnah01]

Is there a simple way to purge air without taking everything apart?

Just keep using the taps and it will eventually self purge. Ours can take up to a fortnight full timing.

 

[acropolis22]

Just keep using the taps and it will eventually self purge. Ours can take up to a fortnight full timing.

Yeah, I'm getting air coming through every so often. You've reassured me. Thanks for that.

 

[Landy Andy]

Have you removed air from the toilet flush system too?

 

[acropolis22]

Have you removed air from the toilet flush system too?

Won't that purge itself too?

 

[Landy Andy]

Won't that purge itself too?

It will by you flushing it to remove the air.

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[62272]

I assume that the pump is activated by pressure drop rather than the electric microswitch type which are activated at each tap switch?

 

[acropolis22]

I assume that the pump is activated by pressure drop rather than the electric microswitch type which are activated at each tap switch?

Yes.

 

[62272]

Yes.

No point me giving you advice on microswitches then. It looks like others have given a reasonable assessment of the likely case though. Best of luck

 

[IRHP]

Sounds normal it needs to build up pressure in accumulator.

 

[acropolis22]

Sounds normal it needs to build up pressure in accumulator.

So why has it never done it before in the 2 years we've owned it?

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[donkey]

The pump may be worn. The supply voltage may be low. The pressure switches do require adjustment from time to time.

Geoff

 

[acropolis22]

The pump may be worn. The supply voltage may be low. The pressure switches do require adjustment from time to time.

Geoff

The pressure switch is on the pump itself?

 

[OutTheOffice]

Mine has just started to do the same thing, 4 or 5 short bursts after it initially turn off. I have look at the pump, and unless im daft cannot see a pressure switch. Would be grateful to know how to locate it

 

[Trevor Wbm]

Yeah, I'm getting air coming through every so often. You've reassured me. Thanks for that.

Probably worth checking all the joints downstream from the pump back to the tank. It may be a slightly loose one letting the air in.

 

[acropolis22]

Quick update. I'm not getting any more air out of the taps, but the pump still runs for 2 or 3 seconds after a tap is closed. I intend to check all connections as suggested, but I don't think air is getting in now. I think the air I was getting was after the tank had run empty a few days ago. That seems to have purged through now. But the pump only started this running on after that incident.

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[dunnah01]

Quick update. I'm not getting any more air out of the taps, but the pump still runs for 2 or 3 seconds after a tap is closed. I intend to check all connections as suggested, but I don't think air is getting in now. I think the air I was getting was after the tank had run empty a few days ago. That seems to have purged through now. But the pump only started this running on after that incident.

I think you just need to be a bit more patient, it will eventually get back to normal if there are no air leaks

 

[IRHP]

So why has it never done it before in the 2 years we've owned it?

No idea but as I said sounds normal. Mine has always done it.

 

[dna]

I had a similar experience last summer. The pump would run for a while after taps closed. Eventually (based on posts on MHF), I checked and the cap on the top of the pump had become loose and was letting a small amount of air into the system. I hand tightened it and that cured it

 

[acropolis22]

I had a similar experience last summer. The pump would run for a while after taps closed. Eventually (based on posts on MHF), I checked and the cap on the top of the pump had become loose and was letting a small amount of air into the system. I hand tightened it and that cured it

Interesting. What type of pump was that?

 

[acropolis22]

Mine has just started to do the same thing, 4 or 5 short bursts after it initially turn off. I have look at the pump, and unless im daft cannot see a pressure switch. Would be grateful to know how to locate it

Obviously it depends what pump you have. Mine is a Shurflo Trail King 7, which I think is quite common. The pressure adjustment screw is at the end of the pump where the water connections are. But it might be hidden under the cap that protects the electrical connectors.

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[OutTheOffice]

Obviously it depends what pump you have. Mine is a Shurflo Trail King 7, which I think is quite common. The pressure adjustment screw is at the end of the pump where the water connections are. But it might be hidden under the cap that protects the electrical connectors.

Thank you : The pump is a whale water master on board pump. I think we have a user manual for just about everything, except the pump and I cannot see anything on line. Im going to try draining the system down when we get home and re-filling. Hopefully that will get rid of any airlocks that might be causing it to pulse.

 

[JockandRita]

Obviously it depends what pump you have. Mine is a Shurflo Trail King 7, which I think is quite common. The pressure adjustment screw is at the end of the pump where the water connections are. But it might be hidden under the cap that protects the electrical connectors.

I have not long since replaced the same model pump, purely because the old one was showing signs of leakage. Even the new pump takes 2-3 seconds to stop operating, as that's the time needed to build up the pressure in the system again.

The pressure adjustment control, is the Philips screw on the end of the black pump housing.

I've just bought another pump to carry as a spare. Fortunately, the SHURflo pumps are more reliable than the Reich twin impeller pumps, whose weak point is the thin plastic shaft connected to the metal motor.

HTH,

Jock.

 

[acropolis22]

I have not long since replaced the same model pump, purely because the old one was showing signs of leakage. Even the new pump takes 2-3 seconds to stop operating, as that's the time needed to build up the pressure in the system again.

I can see the logic in that, but it didn't do it before the tank ran dry. Odd.

I've just bought another pump to carry as a spare. Fortunately, the SHURflo pumps are more reliable than the Reich twin impeller pumps, whose weak point is the thin plastic shaft connected to the metal motor.

Yeah, I carry a spare too, but I'm hoping I don't have to use it.....

 

[dna]

I had a similar experience last summer. The pump would run for a while after taps closed. Eventually (based on posts on MHF), I checked and the cap on the top of the pump had become loose and was letting a small amount of air into the system. I hand tightened it and that cured it

Sorry, I’ll have to get out to the van to check and let you know.

 

[dna]

Sorry, I’ll have to get out to the van to check and let you know.

Its not a brilliant picture (taken inside a cupboard) but I wasn't quite correct. The filter cap I was referring to is actually a separate unit to the left of the pump (under the yellow arrow) . It was that cap that had come loose and tightening it cured the problems I was having.

Hope this helps

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