Chrysler RAM TRUCK 2500 1994 Service Manual page 944

F U E L D E L I V E R Y S Y S T E M — E X C E P T D I E S E L
INDEX
page
Fuel Filter 6
Fuel Filter/Fuel Pressure Regulator 4
Fuel Pressure Leak Down Test—Gas Powered
Engines 7
Fuel Pump Capacity Test—Gas Powered Engines . . 7
Fuel Pump Module—All G a s Powered Engines . . . . 3
page
Fuel System Pressure Release 6
Fuel System Pressure Test—Gas Powered
Engines 6
Fuel Tubes/Lines/Hoses and Clamps 8
General Information 3
Quick-Connect Fittings 8
GENERAL INFORMATION
The fuel delivery system used on gas powered en­
gines of previous years is no longer used. This con­
sisted of a fuel return line that routed excess fuel
pressure back to the fuel tank. The new system will
n o t have a separate fuel return line.
A separate frame mounted fuel filter will not be
used with any gas powered engine.
The Fuel Delivery System for gas powered engines
is controlled by the powertrain control module
(PCM). For additional information, also refer to Pow­
ertrain Control Module (PCM) i n the Multi-Port Fuel
Injection (MFI) sections of this group.
The fuel pump module contains a combination fuel
pressure regulator and fuel filter. Refer to the follow­
ing Fuel Pump Module—All Gas Powered Engines
for additional information.
FUEL PUMP MODULE—ALL GAS POWERED
ENGINES
The fuel pump module on all gas powered engines
is installed i n the top of the fuel tank (Fig. 1). The
fuel pump module (Figs. 1 or 2) contains the follow­
ing:
• A combination fuel filter/fuel pressure regulator
• Electric fuel pump
• Fuel pump reservoir
• A separate in-tank fuel filter
• Pressure relief/rollover valve
• Fuel gauge sending unit
• Fuel supply line connection
• Auxiliary fuel supply fitting (not all engines)
ELECTRIC FUEL PUMP
The electric fuel pump is located i n and is part of,
the fuel pump module (Fig. 2). I t is equipped with a
permanent magnet electric motor. The fuel pump
module is suspended i n fuel i n the fuel tank. Fuel is
drawn i n through a separate filter (located on bottom
of module) and pushed through the electric motor to
the fuel filter/fuel pressure regulator.
PIASTIC
LOCKNUT
FUEL FILTER/
FUEL PRESSURE
REGULATOR
FUEL
SUPPLY
CONNECTION
TOP OF
FUEL TANK
PRESSURE REUEF/
ROLLOVER VALVE
AUXILIARY
FUEL SUPPLY
FITTING
{SOME ENGINES)
PUMP/GAUGE
ELEC. CONNECTION
J94I4-32
Fig. 1 Top View Fuel Pump Module—Gas Powered
Engines—Typical
FLOAT
FUEL GAUGE
SENDING UNIT
LOCKING
TABS
MOUNTING
SCREWS
IN-TANK
FUEL FILTER
J9414-33
Fig. 2 Fuel Pump Module Components—Gas
Powered Engines—Typical
FUEL PUMP ELECTRICAL CONTROL
Voltage to operate the electric pump is supplied
through the fuel pump relay. For an electrical opera­
tional description of the fuel pump, refer to Fuel
Pump Relay-PCM Pin #51—PCM Output. This can