right ive just had a good study of a wiring diagram and the speed sensing relay doesnt affect the fuel pump relay,

all it seems to do is the cold start/warm up circuits, if the cable that is linked to the coil/rev counter(green) was damaged then this system would not work which could well cause the aux air valve to remain open which would intern cause high revs as too much air is getting in to the inlet,
the reason for not starting has to be mainly down to the pump not running as without pressure the mechnical injectors do nothing,
the fact that the car sort of starts says that the ignition is good so the coil is ok so by fitting a temp cable from the coil to the pump relay should make it kick the pump in,
as ive already offered ill pop round and bring a good tester to check the cables (im a sparky by trade)
pm me youre address and a mobile number and ill sort a time out with you