Blake water pump

Talking to a "new" to stationary engines hobby gent yesterday who tells me he has just bought his first engine a Lister D as well as a Blake water pump but he cannot get the pump to deliver any water from outlet, have just googled Blake and see the pump he showed me on his phone photos is one among the photos on their site it looks like the section photo of the innards.

I have no knowledge of these pumps, anyone give me a few ideas what to look for so I can pass them on to Michael, he has been given the info. about this forum so he might also be asking questions.

I used to have a blake high pressure pump, it was huge in contrast to a lister domestic pump, on mine there were 4 non-return valves which had due to the water pressure been squeezed into the valve holes which the water would pass through, I had to made out of thick gasket material the new sealing washers, fill the vessel and it should pump,
If its the same pump we are talking about.
Chris

Thanks Chris, will pass the details on to Michael.

I agree with Chris, It could well be a Blake high pressure pump, such as fitted to a Sellarc pressure washer. You will need to fill this with water and turn it at some speed to get it to pump. I don't know if this is possible, but for rally display you could play around with spring pressure on the valves to see if this improves pumping at lower pressure.