Hi Steve
I have had problems in the past wit sensors and changing them has fixed the problem for a while then fault returns. Might be worth looking at the wiring to the sensor as it sounds possible that you have a bad connection / wire rather than bad sensor itself. Good clean of the connectors in my experience is a good starting point.
I believe that the ECU might not fire up the injectors if there is a problem with the crank sensor as it will think the engine is not turning. Just a thought , but sounds the actual fault heads back in the direction of the crank sensor rather than fuel related.
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