To replace the High Pressure Oil Pump (HPOP) on a 1999 Ford F-350 7.3L, first ensure the vehicle is safely elevated and the battery is disconnected. Drain the oil and remove the oil filter and the valley cover to access the HPOP. Disconnect the oil lines and wiring harness from the pump, then unbolt the HPOP from the engine block. Install the new pump by reversing the removal process, ensuring all connections are secure before reassembling and filling the engine with oil.
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