Originally Posted by
William MK2 Cosworth
common rail means the engine has a fuel rail so the injectors share a low pressure, and each one works as high pressure pump.
This is true of how the 'unit injector' system works on VAG group 'PD' (
Pumpe Dueze)
http://www.myarchive.us/richc/VW_TDI_with_PumpeDuse.pdf
'True' common rail in my mind is when a single high pressure pump feeds a single (common) fuel rail , where the injector for each cylinder is piped from the rail, at pressures of up to 1600bar, then the engine PCM/ECM/ECU (whatever you like to call it) controls the injection duration/pilot injection and quantities electronically.
