Hfcm (Horizontal Fuel Conditioning Module); Hfcm (Horizontal Fuel Conditioning Module) Fuel Flow - Ford 6.0L POWER STROKE Service Procedures And General Diagnostics

FUEL RETURN TO TANK FUEL RETURN TO TANK
FUEL HEATER
FUEL HEATER
FUEL SUPPLY TO HFCM FUEL SUPPLY TO HFCM
FUEL PUMP
FUEL FILTER
THROUGH FILTER INTO PUMP
F U E L S U P P LY S Y S T E M
FUEL SUPPLY TO ENGINE
FUEL SUPPLY TO ENGINE
FUEL RETURN TO HFCM
FUEL RETURN TO HFCM
WATER IN FUEL WATER IN FUEL
FUEL PUMP POWER
FUEL PUMP POWER
FUEL HEATER
WIF SENSOR WIF SENSOR
DTRM
HFCM (Horizontal Fuel Conditioning
Module)
• The HFCM is mounted to the frame rail on
the drivers side.
• The HFCM is a single module that performs
multiple tasks. It heats fuel, separates water
from the fuel, senses when water is present
in the fuel, filters particulates from the fuel,
creates fuel pressure needed to to supply
fuel to the engine mounted fuel filter
• A DTRM (Diesel Thermo Recirculation
Module) is also part of the HFCM. It
recirculates fuel that returns from the engine
mounted fuel filter back into the fuel filter
instead of back to the tank, which in cool
fuel conditions.
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HFCM (Horizontal Fuel Conditioning
Module) Fuel Flow
• Fuel is drawn into the HFCM from the fuel
tank via a supply line.
• If the temperature of the the fuel is below
50°F (10°C) it is heated by the fuel heater.
The fuel heater shuts off at 80°F (27°C).
• After being heated, fuel enters the filter
housing via a one-way check valve.
• Once in the filter housing, water is separated
from the fuel. If large amounts of water are
found in the fuel, a sensor in the separator
warns the operator of this condition by
illuminating a light on the dash.
• Fuel is then drawn through the 10 micron
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fuel filter and into the fuel pump.
• Conditioned pressurized fuel is then supplied
to the engine mounted fuel filter via a fuel
supply line. The pump has an internal
regulator that limits fuel pressure to 100psi.
• Fuel returning from the pressure regulator on
the engine mounted fuel filter comes into the
HFCM and a DTRM either allows the fuel to
return to the tank or returns it to the
unfiltered side of the fuel filter in the HFCM.
The DTRM starts to open (recirculating fuel
back into the pump) at 80°F (27°C) and is
fully open at 50°F (10°C).
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