Dodge RAM TRUCK 1500 1995 Service Manual page 1083

B R
FUEL SYSTEM 1 4 - 1
FUEL SYSTEM
CONTENTS
page
ACCELERATOR PEDAL AND THROTTLE
CABLE . . . . . 2 4
DIESEL ENGINE—COMPONENT DESCRIPTION/
SYSTEM OPERATION 87
DIESEL ENGINE—COMPONENT REMOVAL/
INSTALLATION 1 2 5
DIESEL ENGINE—GENERAL DIAGNOSIS . . . . . 18
FUEL DELIVERY SYSTEM—DIESEL ENGINE .. 11
FUEL DELIVERY SYSTEM—EXCEPT DIESEL . . . 2
FUEL TANKS 2 0
page
GENERAL INFORMATION 1
MULTI-PORT FUEL INJECTION (MFI)—
COMPONENT DESCRIPTION/SYSTEM
OPERATION—EXCEPT DIESEL 28
MULTI-PORT FUEL INJECTION (MFI)—
COMPONENT REMOVAL/INSTALLATION—
EXCEPT DIESEL 7 3
MULTI-PORT FUEL INJECTION (MFI)—
GENERAL DIAGNOSIS—EXCEPT DIESEL . . . 5 3
SPECIFICATIONS
. . . . . . . . . . . . . . . . . . . . . . . 1 4 8
Q E N E R A L
I N F O R M A T I O N
Throughout this group, references are made to par­
ticular vehicle models by alphabetical designation or
by the particular vehicle nameplate. A chart showing
a breakdown of the alphabetical designations is in­
cluded in the Introduction section at the beginning of
this manual.
All vehicles are equipped with either a 3.9L (V-6)
engine, a 5.2L (V-8) engine, two different 5.9L (V-8)
engines, an 8.0L (V-10) engine or a 5.9L (Cummins
in-line 6 cylinder diesel) engine.
The 3.9L. (V-6) and 5.2L (V-8) engines will be re­
ferred to in this group as: LDC (Light Duty Cycle)
engines. The 5.9L (V-8) gas powered engine will be
referred to as either: LDC (Light Duty Cycle) or HDC
(Heavy Duty Cycle) engine. The 8.0L (V-10) and die­
sel engines will be referred to as: HDC (Heavy Duty
Cycle) engine.
Either of the HDC gas powered engines can be eas­
ily identified by the use of an engine mounted air in­
jection pump. The 3.9L/5.2L/5.9L LDC gas engines or
the diesel engine will not use an air injection pump.
The Fuel System consists of: the fuel tank, an
electric fuel tank mounted fuel pump (gas powered
engines), a fuel injection pump (diesel engine), a me­
chanical fuel transfer (lift) pump (diesel) and a fuel
filter. It also consists of fuel tubes/lines/hoses and fit­
tings, vacuum hoses, throttle body and fuel injec­
tors). The powertrain control module (PCM) will
either directly operate or regulate certain compo­
nents of the fuel system. Refer to the Powertrain
Control Module sections for additional information.
The Fuel Delivery System consists of: the electric
fuel pump (gas), fuel injection pump (diesel), fuel
transfer pump (diesel), fuel filter, fuel tubes/lines/
hoses, fuel rail, fuel injectors and fuel pressure regu­
lator.
A Fuel Return System is used on all vehicles (all
engines). On gas powered engines, fuel is returned
through the fuel pump module and back to the fuel
tank. A separate fuel return line from the tank to the
engine is not used on any gas powered engine.
On diesel powered engines, a separate fuel return
line from the tank to the engine is used.
The Fuel Tank Assembly consists of: the fuel
tank, filler tube, fuel gauge sending unit/electric fuel
pump module (electric fuel pump on gas powered en­
gines only), a pressure relief/rollover valve and a
pressure-vacuum filler cap.
Also to be considered part of the fuel system is the
Evaporation Control System. This is designed to
reduce the emission of fuel vapors into the atmo­
sphere. The description and function of the Evapora­
tive Control System is found in Group 25, Emission
Control Systems.
FUEL REQUIREMENTS
Refer to Group 0, Lubrication and Maintenance for
information.