CRS-3 is a common rail system tester that can simulate the engine electronic control unit (ECU) to issue driving signal to drive Bosch, Denso, Delphi high pressure common rail pump and solenoid valve. Combining with traditional high pressure pump test bench, CRS-3 adopts high pressure common rail pump as its high pressure fuel source to test injector and finishes the testing of injecting delivery, return-fuel delivery and injector atomization under different common rail pressure and injecting frequency. By testing high pressure fuel delivery under different speed and different pressure, it can test the situation of high pressure pump.