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J-45873-100 allows the Fuel return volume to be measured on 5.2L and 7.8L medium duty truck diesel Engines. It consists of additional Hose assemblies and Connectors to allow a technician to measure the Fuel volume from each Cylinder, a Set of graduated Cylinders, and Hoses to measure the Pressure Regulator and Pump return Systems. Using J-45873-100 will allow more precise measurement of the Fuel return System to assist in diagnosing Driveability concerns, and prevent unnecessary Parts changing or increased warranty due to incorrect diagnosis.