What causes intermittent failure of a 2002 Chevy Astro 2WD?

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What causes intermittent failure of a 2002 chevy astro 2wd? 1991 chevy astro fuel pump/sending unit reset switch

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1994 Chevy Astro Van Fuel Pump Wiring Diagram - Wiring Diagram

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1991 Chevy Astro Fuel Pump/sending Unit Reset Switch
1991 Chevy Astro Fuel Pump/sending Unit Reset Switch

What causes intermittent failure of a 2002 Chevy Astro 2WD?
What causes intermittent failure of a 2002 Chevy Astro 2WD?

1994 Chevy Astro Van Fuel Pump Wiring Diagram - Wiring Diagram
1994 Chevy Astro Van Fuel Pump Wiring Diagram - Wiring Diagram