137
FUEL SYSTEM
COMPONENTS
7
Fuel Manifolds
The fuel supply and return manif olds route fu el
through the high pressure side of the fuel system.
Fuel Supply Manifold
The fuel supply manifold supplies pressurized fuel
to the inlet port of each fuel injector.
Fuel Return Manifold
The fuel return manifold provides a route for fuel
passing through the f uel injectors to flo w back to
the fuel chamber of the vapor separator.
Fuel Injectors
Fuel injectors are fuel metering, electric solenoids
(55 V) bo lted directly to th e cylinde r he ad. The
EMM controls the a ctivation of each injector b y
rapidly connectin g and disco nnecting the injec-
tor’s internal coil to ground.
Fuel Flow Compensation
The flow rate of each injector is measured as part
of the manufacturing process. This information is
recorded an d a ssigned to the injector b y serial
number.
The EMM is programmed to compensate for vari-
ations in fuel flow. Each injector and its location on
the outb oard is identified b y t he EMM. DO NOT
install an injector without updating the compensa-
tion software.
Each se rvice injector includes it s fu el flow in for-
mation on a 3 .5 in . flop py d isk. This sof tware
allows the EMM to be reprogrammed for this injec-
tor’s unique fuel flow characteristics.
Fuel injectors MUST NOT be moved
from one cyl inder to another . EMM pro gram-
ming is assoc iated with the cy linder loca tion
of each injector . Inst alling an injector on the
wrong c ylinder can result in po werhead fa il-
ure.
Injector Fuel Supply
Fuel is supplied to the injectors by the fuel circula-
tion pump and the fuel supply manifold.
Each inje ctor ha s int ernal fu el p assages. These
passages are designed to:
• Provide fuel to the injector's injection chamber
• Route fuel thro ugh the injector hou sing to coo l
the injector coil and armature.
1. Inlet ports
2. Return ports
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