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The "Fuel Fail 12" code on a 1993 Jaguar XJ6 indicates a fault in the fuel system, specifically related to the fuel pump or its circuit. This could be due to a failed fuel pump, a blown fuse, wiring issues, or a malfunctioning fuel relay. It's important to diagnose the exact cause to ensure proper fuel delivery and engine performance. Checking the fuel pump operation and related electrical components is a good starting point.

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