Minnesota Mini Owner
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https://shop.jmpe.co.uk/products/rover-3-pin-ecu-diagnostic-connector
You should be able to power probe the fuel pump at the inertia switch.
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One other thing is to connect a diagnostic app. They are not a solution but can give you more data points to pinpoint issues. Also useful once you have it running.
This is one:
https://rovermems.com/
There are others. If you are Ok with making a cable, the parts are available from Mouser or Digikey. You can also buy them on ebay.
There are also commercial tools that will connect.
Again I don't have an SPi, but the tools allow you cycle the component relays on an MPi engine.
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If everything is working except fuel and spark, then there are a few things to check. I would verify the continuity of the inertia switch for fuel just to rule it out.
It appears one fusible link feeds the power to the multi function unit main relay with multiple wires. You should be able to back trace those wires to the fusible link. Pretty sure they are the larger gauge brown wires. I do not have an SPi, so may be someone can provide the location of the fusible link.
People do get creative with wiring and there are sone wires that run between the firewall and the engine, if these are not attached in the right place they can be chafed.
Do you hear the fuel pump being primed at all when first turning on the key? In one of the Rover manuals, there is a description of the starting sequence. Although it may not be specific to your year and model, it may have some clues as to where to look. I will see if i can find it.
There is a whole SPi troubleshooting thread on the Mini Forum UK and although a lot would not apply, it may be worth the time to look through it.
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3rd picture - the white wire on the left of the second fuse should be on the top fuse.
White is switched live (from the ignition switch). The green on the other side is fused switched live circuits (gauges, indicators etc).
Brown is permanent live unfused from the battery. Purple on the other side is fused permanent live (horn, interior light etc).
They should be on separate terminals and it could be that the switched live isn't getting to the ignition circuits or relay box.
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This is what a fusible link looks like on an MPi, a later car. I am not sure where they are on your, but it would look similar.
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With a loss of all power, I would look at the fusible links, it appears there are several on your car., but maybe only one or two that could cause a loss of all power. On the Mini forum UK, there have been several discussions on replacing fusible links. Finding a replacement in the US may take some research, but they have been used in US cars since the 60s, at on GM products.
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Pictures 5 & 6 have the fuel pump cutoff reset button in them - it's the oblong repay with the push button on the top.
There is also a LOT of non-standard wiring coming out of that tired looking fusebox...
I'd be unplugging and tracing every circuit.
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https://www.theminiforum.co.uk/forums/topic/324929-wire-diagrams-redrawn/
About midway there is a section: From Rover repair manual AKM 7169 1992 - 1996
That should cover your year.
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My experience is with later MPi and very early Minis. Many times people overlook the fusible link if there is one.
Terry
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Once I cleaned and soldered the underside of the fuse box and got rid of the in line fuses and replaced with spade type fuses, I don't have any more electrical issues. None. I also placed the spade fuse holder above the air cleaner instead of Rover's directly above the exhaust manifold position.
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Check the connections and continuity across all the fuses, and double-check that the correct wires are connected to the correct terminals. If feels like you've inadvertently disabled the whole relay box or the fuel pump.
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