Compression Ignition Addict
Join Date: Feb 2013
Location: Merritt BC
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The factory HFCM will deliver a maximum pressure of 24 psi (relief pressure). I believe the normal operating pressure is between 4 -6 psi . This 4-6 psi is supplied to the secondary fuel filter on the engine, this filter housing has a built in regulator that regulates the fuel pressure supplied to the HPFP to 3 psi +-0.5 psi. The excess fuel delivered to the secondary filter is returned to the HFCM where, depending on its temperature it is either returned to tank or recirculated back to the inlet of the HFCM.
The 3 1/2 psi is delivered to the internal transfer pump of the HPFP which raises the pressure slightly & supplies fuel to the volume control valve & onto the high pressure pistons in the pump. A portion of the fuel from the internal transfer pump is used for internal lubrication of the HPFP and is returned via the fuel cooler. Excess fuel relieved from the HP pressure control valve & the injector leak off passages also returns via the fuel cooler. The return fuel pressure measured at the fuel cooler outlet Schrader valve should be between 3-8 psi.
Fuel from the cooler is directed back into the secondary fuel filter housing.
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