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items are being added regularly. All HUB options communicate via digital link to the ECU, there are
no analogue signals used.
Hubs have a printed panel showing where each cable goes and the orientation of each plug. For all
cables, if you need a longer or shorter version than supplied, please contact Xicoy. Do not cut or
splice in extra wire.
Battery should be connected directly to the Hub, not using switches, electronic regulators, diodes
etc. Multiple battery operation using “Y” lead is possible but at least one battery must be directly
connected. If you are using the full colour plug-in display this is also plugged in here.
Fuel Pump
As mentioned previously, the fuel pump has
been specially designed for this application
and is unique in many ways. It is extremely
small in size and weight but is much more
sophisticated than its looks suggest. There is
not the usual fixed cable with socket but a
small plug built into the pump which enables
a regular high quality JR type servo cable to
be used as the pump cable (socket at both
ends). This way it’s easy to get just the right
length you need without cutting or extending the wire.
Each engine has its dedicated fuel pump. When powering up the ECU will recognise it and if you
try to use the wrong size pump you will get an error message and the engine will not allow a start.
Note: the three wires are NOT for the 3phases usually used for a brushless motor. The three wires
are for the plus and minus power supply, and a single wire bidirectional digital link.
Construction
Inside the sturdy machined aluminium housing is a powerful, purpose made brushless (3-phase)
motor with a ball raced (not plain bearing) shaft carrying a pair of precision close tolerance gears
to provide the displacement pump function. A pair of nipples provides a secure connection for pip-
ing at inlet and outlet. Two tapped holes in the body provide a secure mounting location avoiding
the need for tie-wraps and other messy fixings, for a neat and tidy installation. Never try to disas-
semble the pump, it has an extremely delicate internal structure and you will void its warranty.
Each engine variant has its own pump, you cannot mix and match.
Operation:
The difference between this pump and most others is that it also has its own tiny
brushless 3-phase driver included within the pump housing. The motor is not a slave to an external
driver or an open loop dc motor driven by an external voltage, but has its own sophisticated con-
troller and driver built in. This controller communicates with the ECU via the Hub many thousands
of times a second and this includes the identifier to ensure it is the correct pump for the engine.
