Optima V6-2.7L VIN 8 (2006)
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Fuel Pressure Release: Service and Repair
1. Reduce the internal pressure of the fuel pipes and hoses by the following procedures.
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Disconnect the fuel pump harness connector after removing the rear seat cushion.
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Start the engine and after it stalls, turn the ignition switch to the OFF position.
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Disconnect the battery negative (-) terminal.
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Connect the fuel pump harness connector.