DIESEL or PETROL? Check if there is any loose wire or connector on fuel system supplier. If u have short circuit symptoms, maybe there is any wire touching the engine... if not, maybe the ON -POSITION key relay damage or its wiring... means in ACC position relay still supply the electricity, for any reason ON position has fault of energy.
1st take a look and test the relay.
if not... well u must check the wiring or connectors.
cheers
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