The basic function of PT injector: convert the low-pressure fuel from the PT fuel pump into high-pressure fuel and inject it into the combustion chamber, measure the fuel, work together with the fuel pump to meet the engine’s requirements for fuel supply, and coordinate fuel injection The device drives the cam to complete the spraying process within the specified time and period to ensure excellent atomization and no leakage after spraying. There are three types of PT injectors: B type, C type and D type. The common PT-D type is used on Cummins engines with oil inlet and return passages in the cylinder head.