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If any of the two sensors does not send the correct signal to the ECU, the ECU will not send commands to the injectors nor the ignition. Hence the engine does not start. When you release the key after cranking, power to the fuel pump is not maintained. This is a safety feature.
When cranking, power to the fuel pump is allowed momentarily by the ECU no matter if it sees sensor signals or not. If it sees correct signals it maintains power to the FP. Otherwise it quits and does not allow the FP to run as the engine is not running anyway.
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Gilles
RoW 88 Carrera coupé
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