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I am not sure about a 2000 Chevy Suburban specifically, but if you are referring to an electronic fuel pump, it is possible an in-line pressure sensor may keep a charge on the pump until the fuel line has whatever the minimal pressure is required to ensure ignition the next time you start the vehicle... Once the required pressure is reached, the pump will shut off automatically. If it does not shut off at all, it could be a leak in the fuel line at some point.

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Q: Why does a 2000 Chevrolet Suburban pump run when vehicle is turned off?
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