Methanol - Methanol (Methyl or Wood Alcohol) is
used in a variety of concentrations blended with
unleaded gasoline. You may encounter fuels contain-
ing 3 percent or more methanol along with other
alcohols called cosolvents.
DO NOT USE GASOLINE CONTAINING
METHANOL.
Use of methanol/gasoline blends may result in
starting and driveability problems and damage criti-
cal fuel system components.
Problems that are the result of using methanol/
gasoline blends are not the responsibility of Chrysler
Corporation and may not be covered by the vehicle
warranty.
Reformulated Gasoline
Many areas of the country are requiring the use of
cleaner-burning fuel referred to as Reformulated
Gasoline. Reformulated gasoline are specially
blended to reduce vehicle emissions and improve air
quality.
Chrysler Corporation strongly supports the use of
reformulated gasoline whenever available. Although
your vehicle was designed to provide optimum perfor-
mance and lowest emissions operating on high qual-
ity unleaded gasoline, it will perform equally well
and produce even lower emissions when operating on
reformulated gasoline.
Materials Added to Fuel
Indiscriminate use of fuel system cleaning agents
should be avoided. Many of these materials intended
for gum and varnish removal may contain active sol-
vents of similar ingredients that can be harmful to
fuel system gasket and diaphragm materials.
FUEL DELIVERY SYSTEM
DESCRIPTION
The front wheel drive car uses a plastic fuel tank
located rear center of the vehicle.
The Fuel Delivery System consists of: the electric
fuel pump module, fuel filter, tubes/lines/hoses, fuel
rail, and fuel injectors.
The in-tank fuel pump module contains the fuel
pump. The pump is serviced as part of the fuel pump
module. Refer to Fuel Pump Module.
The fuel filter is replaceable, it is a combination
fuel pressure regulator/filter on the fuel pump mod-
ule. Refer to the Maintenance Schedules in the Intro-
duction section of this manual for recommended fuel
filter replacement intervals.
OPERATION
The fuel system is provided fuel pressure by an in-
tank pump module. The PCM controls the operation
of the fuel system by providing battery voltage to the
fuel pump through the fuel pump relay. The PCM
requires only three inputs and a good ground to oper-
ate the fuel pump relay. The three inputs are:
• Ignition voltage
• Crankshaft Position (CKP) sensor
• Camshaft Position (CMP) sensor
FUEL PUMP MODULE
DESCRIPTION
The fuel pump module contains the fuel pump, fuel
reservoir, level sensor, inlet strainer, and fuel pres-
sure regulator/filter (Fig. 1).
OPERATION
The Chrysler fuel pump modul is an in-tank unit
with an integral fuel level sensor and pressure regu-
lator. The pump is driven by a 12 volt DC motor any
time the fuel pump relay is energized. Serviceable
components on the module include:
• Inlet strainer
• Fuel level sensor
• Fuel Filter/Pressure regulator
The pump draws fuel through a strainer and
pushes it through the motor to the outlet. The pump
contains two check valves. One valve relieves inter-
nal fuel pump pressure and regulates maximum
pump output. The second valve, in the pump outlet,
maintains pump pressure during engine off condi-
tions.
The fuel systems use either a positive displace-
ment, gerotor, (JA/JX) or roller vane pump (PL)
immersiable pump with a permanent magnet electric
motor. This fuel system does not contain the tradi-
tional fuel return lines. The regulator contains a cal-
ibrated spring which forces a diaphragm against the
fuel filter return port. When pressure exceeds the
calibrated amount, the diaphragm retracts, allowing
excess pressure and fuel to vent into the tank.
The maximum deadhead pressure is approximately
880 kPa (130 psi). The regulator adjusts fuel system
pressure to approximately 338 kPa (49 psi).
The inlet strainer, level sensor and fuel pressure
regulator/filter are the only serviceable items.
14 - 2 FUEL SYSTEM LH
DESCRIPTION AND OPERATION (Continued)
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