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PROBABLY INSIDE OF GAS TANK. Definately inside the tank, all Caddy's since 1985 or so, e.g.anything with a throttle body or multi-port injection system. Before you drop the tank and replace the pump, a BIG job, make sure the fuel pump relay is not At Fault. They are in different locations on various models so research that. JHSills

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15y ago
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Q: Where is the fuel pump in a 1989 Cadillac DeVille?
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