water pump coming on

[brian55]

Hi all me again Brian.
Peugeot boxer 2. hdi 2005 auto cruise starfire water pump unit is a posiflo model 3000-151-2201
The problem is the pump sometimes switches itself on without the tap switched on.
This van I am sure does not have switches behind any taps so works on difference in pressure etc.
There is square area on the top of the pump with a screw I think this changes the amount of flow any help appreciated thank you.

 

[Janine]

It might be that you have a small leak which is changing the pressure and triggering the pump.

 

[icantremember]

It sounds like you have a minor leak somewhere in the system or a faulty non return valve on the pump.

PS or a dripping tap

 

[brian55]

Thanks for your help I will look into it.

 

[Silver-Fox]

Or a bit of air in the system maybe?

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[rosalan]

Plastic pipes as they warm up, expand slightly, enough on a previous van to occasionally allow the pump to switch on.

 

[Baden87]

Had the same problem very small leak from pump body , changed pump for new one no more leak

 

[Allanm]

We had the same pump in our Swift, and the same symptoms, the pump ran for a second every couple of hours or so. No leaks in the system, so took the pump out and stripped it down. I could see no evidence of any leaks internally so cleaned it up and put it back together.
Still ran intermittently and got more frequent so I changed it for a Shurflo pump and had no more phantom pump running.