Dodge ram truck 3500 1996 Service Manual page 1235

F U E L
SYSTEM
C O N T E N T S
FUEL DELIVERY SYSTEM-DIESEL ENGINE . .
FUEL DELIVERY SYSTEM-GASOLINE ENGINE
FUEL INJECTION SYSTEM-DIESEL ENGINE . .
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. 69
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112
FUEL INJECTION SYSTEM-GASOLINE ENGINES
GENERAL INFORMATION
page
24
1
G E N E R A L INFORMATION
INDEX
page page
GENERAL INFORMATION
FUEL REQUIREMENTS 2
FUEL REQUIREMENTS—DIESEL ENGINE 2
GASOLINE/OXYGENATE BLENDS 2
INTRODUCTION 1
G E N E R A L I N F O R M A T I O N
INTRODUCTION
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
included 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, two different 8.0L (V-10) engines, or a 5.9L
Cummins in-line 6 cylinder diesel engine.
• The 3.9L (V-6) and 5.2L (V-8) engines will be
referred to in this group as: LDC (Light Duty Emis­
sion Cycle) engines.
• The 5.9L (V-8) gas powered engine will be
referred to as either: LDC (Light Duty Emission
Cycle) or HDC (Heavy Duty Emission Cycle) engine.
• The 8.0L (V-10) engine will be referred to as
either: MDC (Medium Duty Emission Cycle) or HDC
(Heavy Duty Emission Cycle) engine.
• The diesel engine will be referred to as: HDC
(Heavy Duty Emission Cycle) engine.
Either of the HDC gas powered engines can be eas­
ily identified by the use of an engine mounted air
injection 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
mechanical fuel transfer (lift) pump (diesel) and a
fuel filter. I t also consists of fuel tubes/lines/hoses
and fittings, vacuum hoses, throttle body and fuel
injector(s). 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 elec­
tric 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
engines 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.