Fuel Rail Description; Fuel Injection - Jeep 2002 WJ Service Manual

WG
FUEL INJECTOR (Continued)
(7) If injectors four and five were replaced
raise engine back in position and install engine
mount through bolts.
(8) Install engine cover (Refer to 9 - ENGINE -
INSTALLATION).
(9) Connect negative battery cable.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT PUT YOUR
HANDS NEAR PULLEYS, BELTS OR FAN. DO NOT
WEAR LOOSE CLOTHING.
(10) Start engine and inspect for leaks.
FUEL RAIL
DESCRIPTION
The fuel rail acts like a high pressure store. It is
available to all injectors for drawing fuel which has
been compressed by the injection pump. The rail
pressure sensor, rail pressure solenoid, high pressure
line, and the return flow line are attached to the fuel
rail (Fig. 7).
OPERATION
The stored fuel volume inside the rail acts as a
damper for pressure
because of pulsating supply and brief large extrac-
tions of fuel during injector firing. The rail primarily
influences the atomization of fuel at the injector noz-
zle, and the accuracy of injected quantity during
injection.
REMOVAL
WARNING: NO SPARKS, OPEN FLAMES OR SMOK-
ING. RISK OF POISONING FROM INHALING AND
SWALLOWING FUEL. RISK OF INJURY TO EYES
AND SKIN FROM CONTACT WITH FUEL. POUR
FUELS ONLY INTO SUITABLE AND APPROPRI-
ATELY MARKED CONTAINERS. WEAR PROTECTIVE
CLOTHING.
(1) Disconnect negative battery cable.
(2) Remove engine cover (Refer to 9 - ENGINE -
REMOVAL).
(3) Disconnect fuel rail pressure sensor and pres-
sure control valve electrical connectors (Fig. 7).
(4)
CAUTION: When slackening and tightening fuel
injection line union nuts, counter hold with wrench
at threaded connection. ON NO ACCOUNT exceed
the tightening torque at any time. Do NOT crimp or
bend lines.
fluctuations which result
NOTE: After removing lines, seal connections and
ensure cleanliness.
(5) Remove injector high pressure lines (Refer to
14 - FUEL SYSTEM/FUEL DELIVERY/FUEL LINES
- REMOVAL) (Fig. 7).
(6) Remove pressure line of high pressure pump
(Fig. 7).
NOTE: Note attention to the use of locking arm.
(7) Detach fuel return flow line to high pressure
pump at rail (Fig. 7).
(8) Detach fuel return flow line to fuel filter at fuel
filter (Fig. 7).
(9) Remove fuel rail (Fig. 7).
Fig. 7 FUEL PRESSURE SOLENOID
1 - INJECTION LINES
2 - FUEL RAIL
3 - FUEL RETURN LINE
4 - FUEL PRESSURE SOLENOID
5 - OIL LINE
6 - SEALS
7 - FUEL RETURN LINE AT COOLER
8 - HIGH PRESSURE FUEL LINE TO FUEL RAIL
9 - FUEL LINE BRACKET
10 - FUEL PRESSURE SENSOR

FUEL INJECTION

14a - 7