Fuel System Description; Fuel Control Cell (Fcc) Fuel System - PCM HO303 MPI Owner's Operation And Maintenance Manual

ENGINE MAINTENANCE - 11

FUEL SYSTEM DESCRIPTION

WARNING
Extreme caution must be exercised when servicing
the fuel system and/or replacing fuel fi lter. Gasoline
is extremely fl ammable and highly explosive under
certain conditions. Be sure the ignition key is off and
do not smoke or allow open fl ame in the area while
servicing. Wipe up any spilled fuel immediately.
WARNING
Accumulation of water and other fuel contaminants
may form corrosive compounds that can damage
the fuel fi lter, and result in fuel leakage. Ethanol
blended fuel may increase this risk. For this reason,
annual replacement of the fuel fi lter, at a minimum, is
required to avoid risk of explosion or fi re.
WARNING
Extreme caution must be exercised when servicing
the fuel system. The fuel system operates under
high pressure. Use caution when removing or
replacing components, as residual pressure may be
present.
WARNING
Make sure that there are no fuel leaks before closing
the engine hatch.
WARNING
Visually inspect unit for fuel leaks before operating
the engine. If fuel leaks are present, DO NOT
operate the engine, contact your service center
immediately.
40

Fuel Control Cell (FCC) Fuel System

The Fuel Control Cell (FCC) eliminates vapor lock and
air ingestion caused by fuel tank slosh, and provides the
necessary fi ltration and water separation.
The FCC system incorporates two (2) fuel pumps to
provide an uninterrupted fl ow of fuel to your PCM marine
engine. Fuel is fed into the FCC bowl by a low-pressure,
high-volume electric fuel pump. This pump fl ows fuel at
a volume much greater than the fuel fl ow rate required of
the high-pressure pump and engine demands. The high-
pressure pump, mounted inside the FCC bowl, provides
the necessary fuel pressure and volume to maintain
proper engine performance. The FCC constantly has
an ample supply of fuel to meet the idle, cruise and
acceleration fuel requirements of the engine.
The fuel pressure regulator may be located on the fuel
rail or inside the FCC bowl, controls the fuel pressure
and maintains a constant pressure across the fuel
delivery system. Excess fuel, not used by the engine,
returns to the FCC bowl.
The fuel delivered to the engine by the FCC is fi ltered
by a fi lter and water separator element, which surrounds
the high pressure pump inside the FCC bowl.
As indicated above, fuel enters the FCC bowl from
two (2) locations, the low-pressure pump (initial input)
and the fuel pressure regulator (unused, recirculating
fuel). Fuel exits the FCC bowl at two (2) locations, the
high-pressure output to the fuel injection system and all
excess fuel in the FCC bowl is routed back to the tank
via the return line.
L510010-11