All that factory alarm could do - don't allow to switch on starter interlock relay, nothing else. And nothing related to fuel pump relay. Fuse holder is for switching engine management into service mode or blinking fault codes. Obviously early C3's had no engine management that smart.
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Originally Posted by missfire
I mean the fuel computer, whatever it's called, there are two big ECUs in post 1991 C3 cars, one under each kick panel in the driver and passenger footwells. One does the ignition, one does the fuel, hence the K 'E'
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Fuel pump relay is turned on by ignition control unit, so we can forget about fuel injection stuff in this thread. Older engines without electronic ignition use fuel pump relay that has enough logic inside to turn on and keep running fuel pump according to rpm signal.