Chrysler Sebring 2005 Service Manual page 1341

14 - 6 FUEL DELIVERY
FUEL PRESSURE REGULATOR (Continued)
Fig. 7 PRESSURE REGULATOR
(1) Lightly lubricate the O-rings with clean engine
oil and place them into opening in pump module.
(2) Push regulator into opening in pump module.
(3) Tabs hold regulator in housing.
FUEL PUMP
DESCRIPTION
The electric fuel pump is located in and is part of
the fuel pump module. It is a positive displacement,
gerotor type, immersible pump with a permanent
magnet electric motor. The fuel pump module is sus-
pended in fuel in the fuel tank.
OPERATION
The pump draws fuel through a strainer and
pushes it through the motor to the outlet. The pump
contains a check valve. The valve, in the pump out-
let, maintains pump pressure during engine off con-
ditions, for a short while. It is normal for fuel
pressure to drop to zero after cooldown. The fuel
pump relay provides voltage to the fuel pump. The
fuel pump has a maximum deadheaded pressure out-
put of approximately 880 kPa (130 psi). The regula-
tor adjusts fuel system pressure to approximately
400 kpa ±34 kpa (58 psi ± 5 psi).
FUEL PUMP MODULE
DESCRIPTION
The fuel pump module contains the fuel pump, fuel
reservoir, level sensor, inlet strainer, fuel pressure
regulator, and fuel filter (Fig. 8).
Fig. 8 FUEL PUMP LOCATION
OPERATION
The Chrysler fuel pump module 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
• 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 system use a positive displacement, gero-
tor, with a permanent magnet electric motor. This
fuel system does not contain the traditional fuel
return lines. The regulator contains a calibrated
spring which forces a diaphragm against the fuel fil-
ter return port. When pressure exceeds the cali-
brated 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 400 ±34 kPa (58 ± 5 psi).
The inlet strainer, level sensor and fuel pressure
regulator are the only serviceable items.
REMOVAL
(1) Release fuel pressure, Refer to Fuel System
Pressure Release Procedure in the Fuel Delivery sec-
tion.
(2) Remove Fuel Tank refer to the Fuel Tank
Removal/Installation in this group.
JR