6BT5.9 Cummins Fuel Pump 3963962 Parts Catalog Ref No. Part Name Part No. Required 1 Fuel Pump 3963962 1 2 Temperature Switch 4327029 1 3 Wiring Harness 3923303 1 Above is the introduction of the 3963962 Cummins Fuel Pump, while if you need Fuel Pump 3963962, complete Cummins engine or other Cummins product, please further consult our sales.