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Fuel Supply System Features
•HorizontalFuelConditioningModule(HFCM)
•(1)ChassisMounted10MicronFuelFilter
•(1)EngineMounted4MicronFuelFilter
•WaterSeparator
•FuelCooler
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Fuel supply system
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Fuel Supply System Features
• ThefuelsupplysystemusesanewHorizontalFuelConditioningModule(HFCM).TheHFCMfiltersfuel,separateswater,senseswater,andrecirculateswarmfuelthroughthepumpduringcoolfuelconditions.
• The6.4LPowerStroke®Dieselalsouses2fuelfiltersandastandalonefuelcoolersystem.
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Fuel supply system
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Fuel FlOW
Engine Fuel Flow
• Thefuelpump,locatedintheHorizontalFuelConditioningModule(HFCM),drawsfuelfromthefueltankandthrougha10micronfuelfilter.
• TheHFCMcontainsthefuelpump,filter,waterseparator,waterinfuelswitch,fueldrain,anddieselthermorecirculationvalve(DTRM).
• TheDTRMcontrolstheflowoffuelreturnedfromtheenginemountedfilterthroughtheHFCM.Ifthefuelbeingdrawnfromthefueltankiscoolerthanaspecifiedtemperaturethenreturnfuelfromtheengineisrecirculatedintotheinletofthepump.
• AfterthefuelisconditionedbytheHFCM,thecleanpressurizedfuelissenttotheenginemountedfuelfilterassemblywhereparticleslargerthan4micronarefilteredoutofthefuel.
• TheenginemountedfuelfilterassemblyalsoregulatesfuelpressurebyreleasingexcesspressureviaareturnfuellinebacktotheHFCM.Theenginemountedfuelfilteralsocontainsairbleedorificestoremoveairandreturnittothetank.
• AfterthefuelisfiltereditisroutedtotheInternalTransferPump(ITP).
• TheITPislocatedinsidethehighpressurefuelinjectionpumpandisusedtoincreasethefuelpressuresuppliedtothehighpressurefuelinjectionpump’sthree(3)internalpistons.
• Afterthefuelispressurizeditisroutedtothehighpressurefuelrailsandtothefuelinjectorsviahighpressurefuelsupplytubes.
• APressureControlValve(PCV)locatedintheoutletsideofthehighpressurefuelinjectionpumpcontrolsthefuelpressurebydumpingexcessfuelintothefuelreturnline.
• AFuelRailPressure(FRP)sensorlocatedintherightsidefuelrailmonitorsthefuelpressure.
• Returnfuelfromtheinjectorsisroutedthroughadrilledpassagefromeachcylinderheadwhereitisthenunitedwithreturnfuelfromthehighpressurefuelinjectionpumpbeforebeingsenttothefuelcoolerandbacktotheenginemountedfuelfilter.
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Fuel Supplyto HFCM
Fuel Returnto Tank
Fuel Returnto HFCM
Fuel Supplyto Engine
To Filter/Pump(suction side)NOTE: Drilled Passage Hidden
Pump Outlet
Fuel Return Directed via DTRM to Tank or Back Through Pump
Fuel Cap Fuel Filter Fuel Pump
Fuel InletCheck Valve
DTRM
Manifold
Drain Valve
Fuel PumpPower
Water In Fuel Sensor51
Fuel supply system
HFCM (Horizontal Fuel Conditioning Module)• TheHFCMismountedtotheframerailonthedriversside.
• TheHFCMisasinglemodulethatperformsmultipletasks.Itseparateswaterfromthefuel,senseswhenwaterispresentinthefuel,filtersparticulatesfromthefuel,andcreatesthefuelflowneededtosupplyfueltotheenginemountedfuelfilter.
• ADTRM(DieselThermoRecirculationModule)isalsopartoftheHFCM.Itrecirculatesfuelthatreturnsfromtheenginemountedfuelfilterbackintothefuelfilterinsteadofbacktothetank.
HFCM Fuel Flow• FuelisdrawnintotheHFCMfromthefueltankviaa
supplyline.
• Fuelentersthefilterhousingviaaone-waycheckvalve.
• Onceinthefilterhousing,waterisseparatedfromthefuel.Iflargeamountsofwaterarefoundinthefuel,asensorintheseparatorwarnstheoperatorofthisconditionbyilluminatingalightonthedash.
• Fuelisthendrawnthroughthe10micronfuelfilterandintothefuelpump.
• Conditionedpressurizedfuelisthensuppliedtotheenginemountedfuelfilterviaafuelsupplyline.Thepumphasaninternalregulatorthatlimitsfuelpressureto24psi.
• FuelreturningfromthepressureregulatorontheenginemountedfuelfiltercomesintotheHFCMandaDTRMeitherallowsthefueltoreturntothetankorreturnsittotheunfilteredsideofthefuelfilterintheHFCM.TheDTRMstartstoopen(recirculatingfuelbackintothepump)at80°F(27°C)andisfullyopenat50°F(10°C).
HFCM Components
• TheHFCMiscomposedofsix(6)maincomponents:
- Housing
- FuelFilter(10micron)
- FuelCap
- ElectricFuelPump
- Manifold(containsthefuelinletcheckvalve)
- DieselThermoRecirculationModule(DTRM) isalsopartoftheHFCM.Itrecirculatesfuelthat returnsfromtheenginemountedfuelfilterback intothefuelfilterinsteadofbacktothetank.
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Fuel Return Banjo Bolt
Filter Housing
Engine Mounted Fuel Filter
Filter Cap
Fuel Supply
Fuel PressureRegulator LocatedInside StandpipeAssembly
Fuel Return to Tank
Fuel Returnfrom Cooler
Filtered FuelOutlet
Fuel Temperature Sensor (FTS)
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fuel supply system
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Engine Mounted Fuel Filter
• Anenginemountedfuelfilterismountedtotheintakemanifold.
• Theenginemountedfuelfilterisa4microncartridgestylefilter.
• Italsoincorporatesafuelpressureregulator(inthestandpipe)andanairbleed.FuelfromtheregulatorisreturnedtotheHFCM.
NOTE: Please exercise extreme cleanliness when servicing the fuel filter.
Fuel Pressure Regulator
• Thefuelpressureregulatorislocatedinsidetheenginemountedfuelfilterhousinginthestandpipe.
• ItregulatesfuelpressurebyroutingunfilteredfuelfromthefilterhousingtotheHFCMviaaspringloadedpoppetstylevalve.
• Thecrackingpressure(pressureatwhichthevalvebeginstoopen)ofthevalveis2psi+\-0.5psi.Actualfuelpressuremaybeaboveorbelowthisspecification.
• Theregulatedpressureofthevalveis3psi+/-0.5psi.Actualfuelpressuremaybeaboveorbelowthisspecification.
NOTE: The fuel pressure regulator is NOT serviceable separate from the housing! If the regulator needs to be replaced, then the entire housing must be replaced.
Fuel Return Banjo Fittings
• Thefuelreturnlines(locatedonthefrontofeachcylinderhead)utilizeabanjobolttoroutethereturnfuelbacktothefuelsystem.
NOTE: The 6.0L Power Stroke® Diesel utilized a banjo bolt with a check valve inside. Do not interchange the 6.0L banjo bolt with the 6.4L banjo bolt.
NOTE: The 6.4L Power Stroke Diesel uses an open banjo bolt with no check valve. The check valves are no longer needed since the drilled passages in the cylinder heads are now utilized as fuel return passages.
Fuel supply system