Technicians need to understand fuel rail pressure control on common rail diesel (CRD). In order to operate efficiently on common rail diesel (CRD), the correct fuel pressure must be maintained under all driving and load conditions. To do this, use the intake control valve (SCV) or fuel metering control valve (FMCV) operated by the ECU located on the back of the high-pressure fuel pump.

If you have a metering valve adjustment device. Use the suction control valve adjusting device (signal generator) on the pump to adjust the driving current of the suction control valve to see the change of rail pressure.The diesel suction control valve can be removed from the pump, and the driving current of the valve can be adjusted by the suction control valve common rail diesel adjusting device (signal generator) to see the movement of the spool.