Operation; Removal; Installation - Chrysler 2004 Concorde Service Manual

LH
FUEL PUMP MODULE
DESCRIPTION
The fuel pump module contains the fuel pump, fuel
reservoir, level sensor, inlet strainer, and fuel pres-
sure regulator.

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
• 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, 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 400 ±34 kPa (58 ± 5 psi).

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.
WARNING: THE FUEL RESERVOIR OF THE FUEL
PUMP MODULE DOES NOT EMPTY OUT WHEN THE
TANK IS DRAINED. THE FUEL IN THE RESERVOIR
WILL SPILL OUT
REMOVED.
(3) Disconnect fuel line from fuel pump module by
depressing quick connect retainers with thumb and
fore finger.
(4) Slide fuel pump module electrical connector
lock to unlock.
(5) Disconnect the electrical connection from the
fuel pump module, by pushing down on connector
retainer and pulling connector off of module.
WHEN THE MODULE
(6) Use Special Tool #6856 to remove fuel pump
module locknut (Fig. 9).
(7) Remove fuel pump and O-ring seal from tank.
Discard old seal.
Fig. 9 FUEL TANK LOCKNUT
1 - SPECIAL TOOL #6856
2 - LOCKING RING
3 - FUEL PUMP MODULE

INSTALLATION

(1) Wipe seal area of tank clean and place a new
seal in position in the tank opening.
(2) Position fuel pump in the tank. Make sure the
alignment tabs on the underside of the fuel pump
module flange (Fig. 10) sits in the notches on the fuel
tank (Fig. 11).
IS
Fig. 10 PUMP MODULE NOTCH
FUEL DELIVERY 14 - 7