Fuel Filter / Water Separator Description; Operation; Installation; Fuel Pump - Jeep 2002 WJ Service Manual

WG
FUEL FILTER / WATER SEPARATOR (Continued)
(1) Disconnect negative battery cable.
(2) Insert a suitable hose into the fuel drain port
in rear of filter, turn drain port counterclockwise and
drain fuel into a suitable and appropriately marked
container.
(3) Disconnect fuel feed and return lines at fuel fil-
ter and set aside.
(4) Disconnect fuel heater electrical connector at
fuel filter.
(5) Remove fuel filter retaining bracket bolt and
remove fuel filter.

INSTALLATION

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.
NOTE: Assure fuel filter drain port is closed.
(1) Connect fuel heater electrical connector.
(2) Position fuel filter in bracket and tighten
retaining bolt.
(3) Connect fuel feed and return lines.
(4) Connect negative battery cable.
(5) Start engine and inspect for leaks.

FUEL PUMP

DESCRIPTION

DESCRIPTION - HIGH PRESSURE PUMP

The high pressure pump is a radial piston pump
with three pistons arranged at an angle of 120°. The
high pressure pump is driven at about 1.3 times the
speed of the camshaft. The high pressure pump is
mounted to the front of the cylinder head (Fig. 1).

DESCRIPTION - LOW PRESSURE PUMP

The low pressure pump (Fig. 2)supplies an ade-
quate quantity of filtered fuel in all operating condi-
tions from the fuel tank, at an adequate pressure, to
the high pressure pump.
Fig. 1 HIGH PRESSURE PUMP
1 - FUEL RETURN LINE
2 - FUEL LINE BRACKET
3 - HIGH PRESSURE PUMP
4 - O-RING
5 - PUMP DRIVE
6 - FUEL LINE BRACKET
7 - HIGH PRESSURE FUEL LINE FROM PUMP TO FUEL RAIL

OPERATION

OPERATION
LOW PRESSURE SIDE
The fuel supplied by the fuel delivery pump flows
through the fuel feed to the throttle valve. Any air
entrained by the fuel is directed through the restric-
tor to the return flow. The throttle valve opens
against the force of the spring at a pressure of
approx. 0.4 bar and the fuel is able to flow along a
ring line to the individual pistons. The eccentric
shaft with its eccentric plate moves the pistons up
and down against the piston spring of the three
pump elements. The leak fuel from the pistons flows
along the return flow to the fuel tank. The fuel flow-
ing out of the throttle valve, also flows off along the
return flow.
FUEL DELIVERY 14a - 13