Fuel Injector Rail/Fuel Damper-2.5L Engine; Fuel Rail/Fuel Damper-4.0L Engine - Jeep cherokee 2000 Service Manual

XJ
DESCRIPTION AND OPERATION (Continued)
injector pulse width based on various inputs it
receives.
Battery voltage is supplied to the injectors through
the ASD relay.
The PCM determines injector pulse width based on
various inputs.
FUEL INJECTOR RAIL/FUEL DAMPER—2.5L
ENGINE
DESCRIPTION
The fuel injector rail is used to mount the fuel
injectors to the engine (Fig. 5). On the 2.5L 4–cylin-
der engine, a fuel damper is located at the front of
the fuel rail (Fig. 5).
Fig. 5 Fuel Injector Rail/Fuel Damper—2.5L Engine
1 – FUEL DAMPER
2 – FUEL INJECTOR
3 – NUMBERED TAG
4 – FUEL RAIL
5 – FUEL RAIL MOUNTING BOLTS/NUTS
6 – TEST PORT
7 – CABLE BRACKET
OPERATION
The fuel injector rail supplies the necessary fuel to
each individual fuel injector.
The fuel damper is used only to help control fuel
pressure pulsations. These pulsations are the result
of the firing of the fuel injectors. It is not used as a
fuel pressure regulator. The fuel pressure regulator is
not mounted to the fuel rail on any engine. It is
located on the fuel tank mounted fuel pump module.
Refer to Fuel Filter/Fuel Pressure Regulator in this
group for information.
The fuel rail is not repairable.
FUEL RAIL/FUEL DAMPER—4.0L ENGINE
DESCRIPTION
The fuel rail is mounted to the intake manifold
(Fig. 6). It is used to mount the fuel injectors to the
engine. On the 4.0L 6–cylinder engine, a fuel
damper is located near the center of the fuel rail
(Fig. 6).
Fig. 6 Fuel Rail/Fuel Damper—4.0L Engine
1 – INJ. #1
2 – INJ. #2
3 – INJ. #3
4 – INJ. #4
5 – INJ. #5
6 – INJ. #6
7 – FUEL INJECTOR RAIL
8 – FUEL DAMPER
9 – PRESSURE TEST PORT CAP
10 – MOUNTING BOLTS (4)
11 – QUICK-CONNECT FITTING
OPERATION
The fuel injector rail supplies the necessary fuel to
each individual fuel injector.
The fuel damper is used only to help control fuel
pressure pulsations. These pulsations are the result
of the firing of the fuel injectors. It is not used as a
fuel pressure regulator. The fuel pressure regulator is
not mounted to the fuel rail on any engine. It is
located on the fuel tank mounted fuel pump module.
FUEL SYSTEM 14 - 5