Duramax Lifetime Supporter
Join Date: Aug 2010
The CP4 has COV (Cascade overflow Valve) and GP Fuel enters the feed port, the COV is closed fuel is diverted to the Internals and Combustion circuits. Once its primed the GP will build Internal pressures, The COV will regulate the fuel delivery to combustion and internal cooling and lubricating then is returned to Fuel Tank, (RPMS) determine the volume VIA GP and Combustion fuel use.
The FCA/FPR regulates combusting fuel that is supplied buy the GP, The FCA/FPR default is Wide open No Voltage. Its Generally at WO when cranking, The Pressure Sensor must detect 1800PSI+ to send signal to ECM/PCM to fire the hot hole and the engines starts and takes of running, this all can happen in less then 2 seconds of cranking if the system is tight and primed.
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