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DESCRIPTION AND OPERATION
The fuel pump attaches with the power steering
pump to the flywheel housing at the rear left side.
It turns on the same shaft as the power steering
pump. The common drive gear meshes with the
auxiliary idler driven by the crankshaft gear. At
600 rpm, the pump delivers minimum 100 kPa
(14.5 psi); and at 1200 rpm, 300 kPa (43.5 psi).
At 400–550 kPa (58–80 psi), the fuel pressure
regulator valve opens to control fuel gallery
pressure.
Fuel is drawn by the suction side of the fuel pump
from the fuel tank into the ECU cooling plate and
enters the fuel filter housing. Fuel passes by the
one-way check valve which prevents the bleeding
of fuel back to the fuel tank and into the primary
fuel filter. The fuel becomes filtered by passing
through the filter media from the outside to the
center of the primary fuel filter. The fuel leaves
the primary filter and passes by a one-way valve
located in the threaded nipple of the primary filter.
The fuel flows from the filter housing to the
suction side of the fuel pump through an external
fuel line. Fuel becomes pressurized after leaving
the fuel pump and flows back to the filter housing
to enter the secondary filter. The fuel becomes
filtered by passing through the filter media from
the outside to the center of the secondary filter.
The fuel leaves the secondary filter and passes
by an automatic air bleed valve which is located in
the threaded nipple for the secondary filter. Fuel
passes by the fuel pressure sensor and then exits
the filter housing to enter the rear of the cylinder
head through an external fuel line. After fuel
enters the cylinder head, it passes through the
fuel gallery of the cylinder head to continuously
deliver fuel to all six unit injectors. Fuel leaves the
cylinder head after passing by the fuel pressure
regulator located at the left front corner of the
cylinder head. Fuel is routed back from the
cylinder head to the filter housing through an
external fuel line to deliver some return fuel back
into the suction side which goes to the fuel pump.
Any excessive fuel not consumed is bled off
through the de-aeration valve and then, directed
back to the fuel tank.
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