[PAUL JAMES]

Basically switch it on, works fine, next house switch it on and pump sounds like it is working but no water. I tried to physically suck it through today and it actually kicks in when you do this but next house same again. I have checked all connections and they are ok. Just banging my head against a  brick wall now. Only info I can give is Shurflo pump, flat bed tank running through a double DI.

[Dave Willis]

Air lock.

[PAUL JAMES]

Dave, thanks for the reply mate-much appreciated.
Any advice on what to do to sort it?

Cheers
Paul.

[Don Kee]

When you move to another house, do you mean move the van?
Sometimes if your water is low, when you move the van the pump will draw air. A non return valve will sort this.
If its just when you turn your tap off and then on again and its happening, your pump is drawing air from somewhere so check to see if your fittings are tight

[Dean Taberner]

Fill a 25lit barrell full of water, put it higher up than the pump and syphen(spelling) the water from the barrell into the pump until the pump itself is sucking the water itself. This is what I do and it works.

[Dave Willis]

Where to start?

Get the pump as low as possible, get rid of as many hoselock connectors as you can and jubille clip your hoses to barbed tails. Lay flat tanks are bad for air locks due to the water sloshing about once you get to half full - when you brake it sloshes up one end of the tank exposing the outlet. Sometimes when you shake the pipe to pump you can hear the air going through. Are you pulling water or pushing it through the di vessels? Can you see air in your strainer?

[PAUL JAMES]

Cheers for the advice people, much appreciated and I will try the said suggestions. Dave the DI vessels are after the pump so pushing it through.

Paul.

[Mike #1]

Non return valve as well in between tank outlet and first DI vessel , You will be getting a fair size airlock basically the distance between outlet and DI .

Whacking pump on full flow will draw it through but not ideal everytime.  Nike

[bobplum]

blockage in the filter?

if it was a airlock, whack up the speed and blow it out