fuel pump is activated for some time when ignition is turned on and is turned off if you won't start engine.
also if crank sensor is faulty it'll stall engine and you won't be able to start it. as Ganz said usually needs some tome to cool down so you could start engine again. however for the cam sensor, at least what I've seen on 156 JTD, if it's faulty engine won't rev above 3000rpm and if turned off won't start.
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