Fuel Rail: Description and Operation

The fuel rail acts like a high pressure store.It is available to all injectors for drawing fuel which has been compressed by the high pressure injection pump The rail pressure sensor, rail pressure control valve, high pressure line, and the return flow line are attached to the fuel rail

The stored fuel volume inside the rail acts as a damper for pressure fluctuations which result because of pulsating supply and brief large extractions of fuel during injector firing The rail primarily influences the atomization of fuel at the injector nozzle, and the accuracy of injected quantity during injection