You maybe way ahead of me, but, other than the initial prime without rpm signal during cranking, the fuel pump relay will not energize. Now, there is an oil pressure switch in parallel with fuel pump relay, just a redundant power supply to the pump. If that switch is stuck in the closed position, the pump will run until it runs down the battery or burns up the pump.
Your mechanic does not have access to wiring diagrams for your vehicle?
Is this an after market security system? I do not appear to have anything on it?
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Tuesday, February 21st, 2017 AT 2:55 PM