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passengers side kick panel GM cars use a oil pressure cut off relay to disable the fuel pump. If the vehicle is involved in a crash, this cuts power to the fuel pump when it senses no oil pressure. There is a by pass circuit that will run the fuel pump for a few seconds to allow the car to start. If it doesn't start within this time frame, the pump won't re engage until the engine builds up enough pressure close the relay.

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Q: Where is the fuel cut off switch on a 1991 Chevrolet Suburban?
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