There are several common types of electric fuel pumps available to fit the mini:
Facet solid state This is a small square pump which must be mounted
below the level of the fuel tank; also this fuel pump must be fitted with a pre filter as it is sensitive to debris
Facet interrupter A cylindrical design with the inlet/outlet mounted each end of the pump. This type can be
mounted pretty much anywhere; it is recommended with this pump that you mount it with the outlet above the level
of the inlet to avoid airlocks in the system
SU interrupter These were fitted to some minis as standard, and also a lot of other British cars using SU
carbís. It is another cylindrical pump, but the inlets and outlets are both at the same end of the pump. The top of
the pump looks similar to the top of a standard mechanical fuel pump
All of the above fuel pumps should be used with a fuel pressure regulator,
as they pump the fuel in squirts and also at a higher pressure than the SU carb can handle.
What you will need
cable capable of 10A
10A fuse & holder
a fuel pressure switch (recommended)
an on/off switch
a 30A automotive relay (4 or 5 pin)
some crimp terminals
How to fit
The fuel side of things is dead easy, just make a cut in the fuel line and stick the pump in.
The pressure regulator is fitted exactly the same but as close to the carb as possible.
BE SURE TO USE PROPER PETROL LINE PIPE CLIPS ON ALL JOINTS IN THE FUEL LINE, NOT THE JUBILEE TYPE!
The electrical side is a bit more involved.
Find a 12v feed which comes live with ignition. There are 2 easy places to find this, they are at the ignition coil, and at the fuse box.
You will need to run a wire from this to one terminal of the oil pressure switch (if fitted).
From the oil pressure switch you should run a wire to the on/off switch.
From the on off switch you need to run a wire to terminal 85 of the relay,
and a wire from terminal 86 of the relay to earth (the carís body).
Now you need to run a cable from a permanent 12v feed, which can be found either
at the battery or on the solenoid (the heavy terminal which has the most wires going to it).
You will need to run a wire from this 12v permanent feed to the fuse.
Next run a wire from the fuse to terminal 30 of the relay, and a wire from terminal
87 to the fuel pump.
Earth the fuel pump as recommended by the manufacturer.
This is the set-up used more in race than road, as it requires you to
turn the engine over until there is sufficient oil pressure before the fuel pump will work.
It is not very suited for road use.
To overcome this you will need to fit an extra wire, which runs from the
cold start terminal (the small female spade terminal opposite the trigger terminal on the solenoid)
to the output side of the oil pressure switch.
NOTE: You can fit the fuel pump without the oil pressure switch but do so at
your own risk. The purpose of the oil pressure switch is to kill the fuel pump in the event of an accident.
If you choose not to fit the oil pressure switch you do not need to bother with the cold start wire either.