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To calibrate the fuel system of a 4DR5 engine, start by ensuring that the fuel filter is clean and that there are no leaks in the fuel lines. Next, set the injection pump timing according to the manufacturer's specifications, typically using a timing light or dial gauge for precision. Adjust the fuel delivery by fine-tuning the injection pump's fuel screw, aiming for optimal performance and efficiency. Finally, test the engine under load to confirm proper fuel delivery and adjust as necessary.

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