Section 07
ENGINE MANAGEMENT (DI)
Subsection 02
(OVERVIEW)
SMR2003-023_07-02A.FM
07-02-3
The air/fuel rail assembly is mounted on top of the
cylinder head. It provides support for the air/fuel
injectors and both air and fuel regulators. It also
contains passages for the air and the fuel. The rail
is a small reservoir for the injectors that keeps
enough fluid at the proper pressure to supply the
injectors demand.
Fuel Injector
Fuel injectors are used to provide fuel from the
fuel rail to the direct injector.
Fuel Pressure Regulator
A fuel pressure regulator controls the pressure in-
side the fuel rail, and allows the excess of fuel to
return to the fuel tank. The fuel pressure regulator
regulates the fuel pressure at approximately
185 kPa (27 PSI) higher than the air pressure in the
fuel rail. The back side of the diaphragm is ex-
posed to the air rail pressure. As the air pressure
increases in the fuel rail, the fuel pressure needed
to open the regulator will increase equally.
The differential pressure regulation utilizes the air
pressure reference signal to maintain constant
pressure drop across fuel injector orifice.
The initial operating pressure of the regulator is
preset by the manufacturer and is not adjustable.
Direct Injector
Also called air injector, two direct injectors (one
per cylinder) are used to inject air/fuel mixture into
the combustion chamber.
Air Pressure Regulator
An air pressure regulator regulates the pressure of
air delivered by the air compressor.
It regulates the pressure developed inside the air
passage to approximately 550 kPa (80 PSI).
The initial operating pressure of the regulator is
preset by the manufacturer and is not adjustable.
FUEL PUMP MODULE
The fuel pump module is located inside the fuel
tank. The module includes the fuel pump and the
fuel level sensor.
Fuel Pump
It operates at a nominal pressure of approximately
735 kPa (107 PSI).
Fuel Filter
A mesh filter is located at the bottom of the fuel
pump module inside the fuel tank. An inline fuel
filter is also installed on the fuel line going to the
fuel rail.
F12D0AA
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