Just to let you know, whether you wanted me to or not, ZX is now sorted.
If you remember, the priming bulb would not pump up hard; if you clamped the pipe to the injector pump, it did, and kept its pressure.
Replaced all the leak off pipes - they were rock hard - problem solved!
I still haven't figured out why that has fixed it and how the leakoff pipe to the pump is internally connected, and how air gets from there to the fuel.
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