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Thanks?for all your helpful comments.

I wish the 'connect the green test connectors together' had told me anything - I did this as a first step when I started this diagnosis - but there were no codes or non-normal behaviour. I suppose the transient supply voltage?drop from that burned?fuse/holder was not enough to trigger anything.

The pointer to the Standard Products PR260 2.5 Bar (36 psi) fuel pressure regulator was very helpful?- thanks Wayne!?

That's the first one I've seen that actually calls out the pressure spec. I was stupid enough to believe?the claims on the ones I bought (to fit this non-turbo engine).

Since injector flow rate goes as the square root of pressure, a 3.0 Bar FPR would give 10% extra fuel flow (vs. the 2.5 Bar spec). I would expect the ECU closed loop control to deal with this just fine at constant speed but might see some impact at acceleration (better acceleration, higher fuel use?; I don't really need/want either as this is a Frankenmotor). If I was wanting to find out more I could compare the two (but the FPR is hard to get to!).

I could probably have stuck with the 3.0 Bar FPR just fine - the higher fuel pressure?might increase the risk of fuel leaks a little. I put the old Subaru unit back in and it seems good.

Now I have several new spare parts to store away under the seat!

Thanks Again!