INSTALLATION - HIGH PRESSURE LINES
WARNING: HIGH-PRESSURE FUEL LINES DELIVER
DIESEL FUEL UNDER EXTREME PRESSURE FROM
THE INJECTION PUMP TO THE FUEL INJECTORS.
THIS MAY BE AS HIGH AS 1600BAR (23,200 PSI).
USE EXTREME CAUTION WHEN INSPECTING FOR
HIGH-PRESSURE FUEL LEAKS. FUEL UNDER THIS
AMOUNT OF PRESSURE CAN PENETRATE SKIN
CAUSING PERSONAL INJURY OR DEATH. INSPECT
FOR HIGH-PRESSURE LEAKS WITH A SHEET OF
CARD BOARD. WEAR SAFETY GOGGLES AND
ADEQUATE PROTECTIVE CLOTHING WHEN SER-
VICING FUEL SYSTEM.
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) Loosen the fuel rail mounting bolts to install
lines free of stress.
CAUTION: Inspect sealing cone at lines. Replace if
compression points exist. Ensure lines are exactly
located.
(2) Position and install fuel lines (Fig. 2). Tighten
to 22N·m (195 lbs. in.) using a wrench to counterhold
at threaded connection.
(3) Tighten fuel rail to 14N·m (124 lbs. in.).
(4) Connect negative battery cable.
WARNING: USE EXTREME CAUTION WHEN ENGINE
IS OPERATING. DO NOT STAND IN DIRECT LINE
WITH FAN. DO NOT PUT YOUR HANDS NEAR PUL-
LEYS, BELTS OR FAN. DO NOT WEAR LOOSE
CLOTHES.
(5) Start engine and inspect for leaks.
FUEL PUMP
DESCRIPTION
DESCRIPTION - HIGH PRESSURE PUMP
WARNING: (Refer to 14 - FUEL SYSTEM - WARN-
ING)
The high pressure pump is a radial piston pump
with three pistons arranged at an angle of 120° and
an internal shut off valve located in one of the ele-
ments to assist with fuel temperature regulation. 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 and must
be replaced as an assembly should a failure occur
(Fig. 3).
DESCRIPTION - LOW PRESSURE PUMP
The low pressure pump (Fig. 4)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.
OPERATION
OPERATION
LOW PRESSURE SIDE
The fuel supplied by the low pressure 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. 6 PSI (0.4 bar) and the fuel is able to flow
along a ring line to the individual pistons. The eccen-
tric 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.
Fig. 2 HIGH PRESSURE LINES AT INJECTORS
1 - HIGH PRESSURE LINE
2 - CYLINDER HEAD COVER
3 - FUEL RAIL
VA FUEL DELIVERY 14 - 7
FUEL LINES (Continued)
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