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It`s been fine for yonks, just started being a pain,pump is fine it`s drawing in air somehow that`s why i mentioned repositioning cold feed.

Not realy cos I haven`t a clue how to. I imagine I need to move the cold feed possibly tie it into vent from BBU. There must have been probs before because there is a second vent in 10mm coming off flow where it enters cylinder this goes to airjec then up to f&e tank, thought it was strange...

into cylinder in 10mm pipes, this goes off to a airjec, seperate from existing vent, banging pipes full of air,vent rads all ok , 10 mins later, immediately drawing in air, banging again, I know it`s bad pipework config, it wasn`t doing it 12 months ago, but then again it has been drained...