Genuine OEM Jaguar Fuel Pump Tappet, part number AJ814139. This essential engine component is responsible for mechanically driving the high-pressure fuel pump, converting rotational motion from the camshaft into the reciprocating action required for fuel pressurization. It is positioned between the engine's camshaft and the fuel pump assembly. Weighing 0.095 kg, it is a robust, precision-engineered part. Using a genuine OEM fuel pump tappet ensures correct material hardness, dimensional accuracy, and wear resistance, which are crucial for reliable fuel system operation and engine longevity, preventing premature wear and fuel delivery issues.