Right , gave the pump a quick strip down to have a look at the internals again . This is the cylinder in pieces
I'll call the two valves inlet and outlet (bottom and top of cylinder respectively). I tested the valve function by sealing my mouth over the valves and sucking or blowing (ahem). The inlet valve worked as expected and no leakage against lung power . The outlet valve at the top (pictured in my hand and later dissasembled )was leaking somewhat . I stripped it and turned the O ring over . Seems solid now . Reassable the piston into the cylinder and the piston ring didn't look too circular in the cylinder with a signs of wear and scoring on the piston ring seal . That isn't as easy to replace or swap . I put the whole thing together and managed to draw a pint in around 10 strokes again . The back suck is minimal , only a tiny amount of any at all. The only thing that is untested now is the piston ring seal . If that is bypassing beer then the whole function of the outlet valve is bypassed to a degree in proportion to the leakage within the main cylinder (piston ring seal).
What I really want to know now if how many strokes of the pump to draw a pint from someone who has a similar comparable engine ?
I am using a demand valve close to the intake as you mention PeeBee.
Perhaps I will remove the cylinder ring seal and try to make a new one from some suitable rubber or neoprene .
Looking forward to hearing feedback of stroke numbers to pour a pint .
Cheers
Andy
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