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Not sure if this is your problem, but GM liked to route the fuel pump relay through the oil pressure switch. This was a safety feature......if the oil pressure went to 0, like in a crash where the engine was disabled, it would also shut down the fuel pump. Make sure yours is hooked up. Maybe try replacing it.

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Q: What could cause not having power to a fuel pump on a 93 Chevy subarben Already changed fuel pump fuel pump relay an checked all fuses?
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