As you can see it took about two turns to set it at the spill point, which was a very definite setting - I went past and approached it again several times to get it 'spot on' and I can see why they suggest the use of the swan neck rather than just letting it spill over the top of the fitting. It slows to a series of drips which then can be tweaked to no drip.
I then put the one way valve back in the pump, reconnected the injector pipe, and thought it wise at this point to prime fuel though. Stupidly I just flicked the starter motor to spin the engine and there was an almighty BANG and bits flew in all directions
Looking at the poor old pump it had disintegrated - blowing itself off it's mounting flange. At this stage I don't know if perhaps the one way valve mis-seated and it hydraulically destroyed itself. Or if perhaps having raised the tappet two turns the pump piston contacted the top of it's cylinder and mechanically broke it. I'll certainly need to find out before another pump goes on
I have to say that as I was doing the 'rack synchronisation' settings earlier I'd thought that the whole pump / rack set up was rather worn and sloppy, so perhaps this is a blessing in disguise.
Anyway I've dug deep into my pockets and ordered up a pair of injector pumps, so play is suspended until they arrive (so are most other activities like food and drink as they were not cheap