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Fuel pressure regulator ! An it's location is inside the fuel tank .
The fuel pump (FP) module contains the fuel pump, fuel pressure regulator and the fuel sender assembly. The fuel pressure regulator is attached to the fuel pump in the fuel pump module located in the fuel tank. It regulates fuel pressure supplied to the fuel injectors. The fuel pressure regulator is a diaphragm-operated relief valve. Fuel pressure is established by a spring preload applied to the diaphragm. Excess fuel is bypassed through the regulator and returned to the fuel tank.
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side. Next, the fuel pump may be worn out. Usually they get loud or stop working (running). Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side. Is the vacuum line attached? Not leaking or rotted? Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack(s) is/are bad. Checking these in the order listed will more than likely fix your problem. Try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK. At least get a OE pump.
Thanks for choosing FixYa and welcome to the site. Jeep Liberty electric fuel pumps are almost always located inside the fuel tank, but there are some vehicles where the pump may be located along the frame rail or mounted to the body near the fuel tank. It can be done by yourself but when it is in the tank, it is not an easy job. You will have to take the tank off to get to the fuel pump.
The fuel filter is an integral component of the fuel pressure
regulator, which is mounted on top of the fuel pump module, located in
the fuel tank. When the fuel filter/regulator assembly requires service,
the fuel tank must be removed from the vehicle, however, the fuel pump
module does not need to be removed.
Disconnect the battery ground cable.
You dont have to relieve your fuel systems pressure because your jeep has an automatic bleeder.
Remove the fuel tank assembly.
Clean the area around the fuel filter/regulator.
Fig. Fig. 5: Remove the fuel filter/pressure regulator retaining clip from the top of the assembly
Fig. Fig. 6: Replace the old fuel filter/pressure regulator mounting gasket
Disengage the retaining clamp from the top of the filter/regulator assembly. Discard the retaining clamp.
Using 2 small prying tools, pry the filter/regulator assembly out
from the top of the fuel pump module. The filter/regulator assembly will
unsnap from the fuel pump module.
Remove and discard the mounting gasket below the filter/regulator.
Before discarding the fuel filter/pressure regulator assembly,
inspect the assembly to verify that the O-rings are intact. If the
smallest of the 2 O-rings cannot be found on the bottom of the
filter/regulator, it may be necessary to remove it from the fuel inlet
passage in the fuel pump module.
Fig. Fig. 7: Check the condition of the fuel filter/pressure regulator O-rings
Clean the recessed area in the pump module where the filter/regulator assembly is to be installed.
Check the replacement filter/regulator assembly to make sure that the new O-rings are already installed on the assembly.
Apply a small amount of clean engine oil to the O-rings.
Install a new gasket on top of the fuel pump module.
Press the new fuel filter/pressure regulator assembly into the top
of the fuel pump module until it snaps into position (a positive click
must be heard or felt).
The arrow on top of the fuel pump module should be pointed towards the front of the vehicle (12 O&rsquoclock position).
Turn the filter/regulator assembly until the supply tube (fitting) is pointed to the 11 O&rsquoclock position.
Install new retainer clamp (the clamp snaps over the top of the filter/regulator and locks to the flanges on the pump module).
Raise the Neon's rear end on jack stands. Remove the panel inside the trunk covering the fuel pump assembly. The fuel filter should be on top of this. On most Dodge Neons the filter is usually directly attached to the fuel pump. In that case, those two parts should not be separated and should be replaced together.Its a silver dome about 2.5 inchs round with a single plastic hose coming off it.
REMOVAL :------- WARNING: THE FUEL SYSTEM IS UNDER A CONSTANT PRESSURE, EVEN WITH ENGINE OFF. BEFORE SERVICING THE FUEL FILTER/FUEL PRESSURE REGULATOR, THE FUEL SYSTEM PRESSURE MUST BE RELEASED.
Refer to Fuel System Pressure Release in the Fuel Delivery System section of this group. The fuel filter/fuel pressure regulator is located on the top of fuel pump module. Fuel pump module removal is not necessary.
Raise vehicle on hoist.
Disconnect fuel supply line at the Filter/Regulator nipple.
Depress locking spring tab on side of Fuel/Regulator and rotate 90 ° counter-clockwise and pull out. NOTE:Make sure that the upper and lower O-rings are on the Filter/Regulator assembly.
INSTALLATION Lightly lubricate the O-rings with engine oil.
Insert Filter/Regulator into the opening in the fuel pump module, align the two hold down tabs with the flange.
While applying downward pressure, rotate the Filter/Regulator clockwise until the the spring tab engages the locating slot.
Connect the fuel line to the Filter/Regulator.
Lower vehicle from hoist.----------------
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NOTE: The combination fuel filter and fuel pressure regulator is located on the top of the fuel pump module.
Before servicing the vehicle refer to the precautions at the beginning of this section.
Remove or disconnect the following:
The fuel tank
Any debris around the filter/regulator to prevent contaminants from entering the pump module
The fuel filter/regulator from its rubber grommet by twisting and pulling straight up
CAUTION To prevent damage to the coiled fuel line, ensure the filter/regulator is not more than three inches from the fuel pump module.
The old fuel line clamp, by carefully cutting it ensuring not to damage the plastic fuel line (discard the clamp)
The plastic fuel line from the filter/regulator by gently pulling downward
The filter/regulator from the fuel pump module
Install or connect the following:
A new clamp over the plastic fuel line
The filter/regulator to the fuel line
NOTE: Rotate the filter/regulator in the fuel line until it is points toward the front of the tank.
The line clamp to the fuel line using special Hose Clamp Pliers number C-4124
NOTE: Do not use conventional side cutters to tighten this type of clamp.
The filter/regulator into the rubber grommet, pressing by hand
Rotate the filter/regulator until it points towards the front of the vehicle.
The regulator is in the fuel tank. You must drop the tank to get to the system It is part of the fuel pump/fuel pressure regulator/fuel level sending unit. If just changing the regulator which you can,make sure you install new o-rings, put a little clean gas on them to install. Cheaper than a new fuel pump.
Did you replace the fuel pump with a NEW fuel pump, or a used one? Get in the car, insert key and turn to "On". Do not attempt to start. Do you hear the fuel pump run for a few moments? Try it a few times, starting the car each time after you hear the fuel pump run. If the fuel pump does not run, then chances are, it's a bad fuel pump. It could also be the fuel pressure regulator, located on the fuel rail.
I have been working on a simular problem on my daughter's vehicle. with the following additional symptoms. It only fails while hot. Runing fuel preassure checks, I noticed that the preassure rises from 30 psi while running to 40 psi after turning off the hot engine. This is caused by the expansion of the fuel in the rail. I believe that this hgh preassure is causing the regulator to stick closed preventing the fuel to get to the rail during a restart, (as the preassure drops to 0 while the fuel pump does whirrrr during the startup proceedure). It seems to free up after it has cooled then works normally. We ordered a new regulator but haven't received it yet to see if this fixes the problem. There is a possibility that the problem is a weak pump that cannot overcome the stuck regulator but since all the checks are in spec, I'm leaning toward the regulator at the moment.
Is the fuel pump actually coming on??? If it isn't, I would start by checking for a fuel pump relay. This is usually located up in the engine compartment in a black box on the drivers side. Relays are small black boxes approx 1"x1". These have a tendency to go out just like fuses. Also double check your fuses. If you suspect a that a relay is bad, you can interchange them with other relays that look the exact same to see if they really are the problems. These relays are very quick and easy to change and are very cheap. They usually run no more than $10-15.
Any further questions, feel free to ask.