[ftp]

Got to my first job this morning, opened the back doors and could hear that my Shurflow pump had started without me 
Must be an air lock I thought so went through the usual process of disconnecting hoses etc. Couldn't get it to pump any water. Sod it! Drove back home and fitted a spare pump and away it went.
I have taken the top off the duff pump but to my untrained eye can see nothing wrong with it. The diaphrams look fine. Mind you I can't work out how they move ayway any ideas?

[ccmids]

not sure how they work but i would take it to a pump man see what he says .

[ftp]

Just connected it to a battery and watched it spin the moulded plate, put it all back together and it pumps! Must have been an air lock - shame really 'cos I just wasted £85 on a new pump. Ah well .......................