I'll have another play with the pump today. with everyone's tips and hints in mind. I have worked on these mechanical pumps before. I was a motor mechanic in the 60's and 70's when they were quite a usual fitment.
When I fit the glass bowl, I can blow and not suck to prove that the one way receiving valve is working and that the bowl in not leaking. Likewise I can suck and not blow at the delivery valve end. There's something I haven't worked out about the travel of the diaphragm......On the bench.
Cheers Ron
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