check to see if the ground is loose. also there is a fuel pump rely under the hood on the passanger side of the engine compartment inside the power distribution center. hope this helps some if not i have wiring diagram.
The combination Fuel Filter/Fuel Pressure Regulator is located on the fuel pump module. The fuel pump module is located on top of fuel tank.
The filter/regulator may be removed without removing fuel pump module although fuel tank must be removed.
REMOVAL
Remove fuel tank. Refer to Fuel Tank Removal/Installation.
Clean area around filter/regulator.
Disconnect fuel line at filter/regulator. Refer to Quick-Connect Fittings for procedures.
Remove retainer clamp from top of filter/regulator. Clamp snaps to tabs on pump module. Discard old clamp.
Pry filter/regulator from top of pump module with 2 screwdrivers. Unit is snapped into module
Discard gasket below filter/regulator.
Before discarding filter/regulator assembly, inspect assembly to verify that O-rings are intact. If the smallest of the two O-rings can not be found on bottom of filter/regulator, it may be necessary to remove it from the fuel inlet passage in fuel pump module.
INSTALLATION
Clean recessed area in pump module where filter/regulator is to be installed.
Obtain new filter/regulator (two new O-rings should already be installed)
Apply a small amount of clean engine oil to O-rings. Do not install O-rings separately into fuel pump module. They will be damaged when installing filter/regulator.
Install new gasket to top of fuel pump module.
Press new filter/regulator into top of pump module until it snaps into position (a positive click must be heard or felt).
The arrow molded into top of fuel pump module should be pointed towards front of vehicle (12 O'clock position).
Rotate filter/regulator until fuel supply tube (fitting) is pointed towards front of vehicle (12 O'clock position).
Install new retainer clamp (clamp snaps over top of filter/regulator and locks to flanges on pump module).
Connect fuel line at filter/regulator. Refer to Quick-Connect Fittings for procedures.
Install fuel tank. Refer to Fuel Tank Removal/Installation.
WARNING: THE FUEL SYSTEM IS UNDER CONSTANT FUEL PRESSURE EVEN WITH THE ENGINE OFF. THIS PRESSURE MUST BE RELEASED BEFORE SERVICING FUEL TANK .
Two different procedures may be used to drain fuel tank (lowering tank or using DRB scan tool).
The quickest draining procedure involves lowering the fuel tank.
As an alternative procedure, the electric fuel pump may be activated allowing tank to be drained at fuel rail connection. Refer to DRB scan tool for fuel pump activation procedures. Before disconnecting fuel line at fuel rail, release fuel pressure. Refer to the Fuel System Pressure Release Procedure for procedures. Attach end of special test hose tool number 6541, 6539, 6631 or 6923 at fuel rail disconnection (tool number will depend on model and/or engine application). Position opposite end of this hose tool to an approved gasoline draining station. Activate fuel pump and drain tank until empty.
If electric fuel pump is not operating, tank must be lowered for fuel draining. Refer to following procedures.
FUEL TANK REMOVAL
Disconnect negative battery cable at battery.
Release fuel system pressure. Refer to the Fuel System Pressure Release.
Raise and support vehicle.
If Equipped: Remove fuel tank skid plate.
Remove 4 fuel hose shield mounting bolts and remove fuel hose shield from body.
Remove fuel tank fill hose and vent hose clamps at fuel tank filler tube. Remove both hoses at fuel filler tube.
Remove exhaust tailpipe heat shield mounting bolts and remove shield. CAUTION: To protect fuel tank from exhaust heat, this shield must reinstalled after tank installation.
Place a hydraulic jack to bottom of fuel tank. WARNING: PLACE A SHOP TOWEL AROUND FUEL LINES TO CATCH ANY EXCESS FUEL .
Disconnect fuel supply line from fuel extension line near front of fuel tank. Refer to Fuel Tubes/Lines/Hoses and Clamps. Also refer to Quick-Connect Fittings for procedures.
Disconnect EVAP canister vent line near front of tank.
Disconnect fuel pump module electrical connector (pigtail harness) near front of tank. Harness connector is clipped to body.
Remove two fuel tank strap nuts. Position both tank support straps away from tank.
Carefully lower right side of tank while feeding both fuel hoses through access hole in body. Fuel Tank Full And Not Drained Using DRB Scan Tool: To prevent fuel loss through hoses, keep left side of tank higher than right side while lowering. Do not allow hose openings to drop lower than top of tank.
Continue lowering tank until clear of vehicle. Place tank on floor with left side (hose side) higher than right side
Drain tank by removing fuel fill hose at tank. Fuel fill hose is largest of 2 hoses. Insert the drain hose (from an approved gasoline draining station) into hose opening. Drain tank until empty.
If fuel pump module removal is necessary, refer to Fuel Pump Module Removal/installation for procedures.
INSTALLATION
If fuel pump module is being installed, refer to Fuel Pump Module Removal/installation for procedures.
Install fuel fill/vent hoses to tank fittings. To prevent hose from kinking, rotate each hose until index mark on hose is aligned to index tang on fuel tank.
Install hose clamps to hoses. Position clamps between index marks on each hose.
Position fuel tank to hydraulic jack.
Raise tank into position while guiding fuel fill and vent hoses into and through access hole in body.
Continue raising tank until positioned to body.
Attach two fuel tank mounting straps and mounting nuts. Tighten nuts to 10 Nm (90 in. lbs.) torque. Do not over tighten nuts.
Install both fuel hoses to fuel fill tube. Tighten both retaining clamps.
Position fuel hose shield to body. Install and tighten 4 mounting bolts.
Connect fuel pump module pigtail harness electrical connector near front of tank.
Connect fuel pump module supply line near front of tank. Refer to Quick-Connect Fittings for procedures.
good morning to you and welcome to fixya.com. hope we can get you fixed here. just a couple of questions first? have you changed the fuel pump yet? if so where did you buy the pump from? your pump is actually building up to much resistence and is unable to overcome it in turn no power is getting to pump as needed. i have a grand cherokee with 230k so i love hearing that you have that many miles. lets keep you rolling. let me know and ill help you out.
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define power.
1: can't hear buzz?
2: fuel pressure at the fuel rail is zero PSI cranked.
3: my volt meter tells me the pump has 0vdc across the pump pins cranked?
sounds like a bad fuel pump. open the gas cap and listen when you turn the key to the on position, not all the way to engage the starter, you should hear a buzzing for 5 or so secands that is the fuel pump in your gas tank. if you dont hear that buzzing the intank fuel pump is probley not working.
have the key in ignition turn off all excessories so you can hear,turn key to on postion listen to see if pump is working,sounds like a power anttena noise,if you hear this,then have the fuel pressure regulator checked,as could be loosing pressure,causing the hard start issue,or the pump could be bad,listen to car,then go from there.
Does the vehicle have spark ? If it does it is not the crank sensor . The ignition switch supplys power for the fuel pump relay directly ,ASD has nothing to do with it . The PCM - engine computer energizes the fuel pump relay by supplying a ground - if it see's a crankshaft postion sensor signal an if no anti-theft system problems . Do you know what a wiring diagram is ? Here free one's http://www.bbbind.com/free_tsb.html Enter vehicle info . year , make , model an engine size . Under system click on engine , then under subsystem click on fuel controls . Click the search button ,then the blue link. Third diagram down.
sometimes the neutral safety switch goes out and thus it doesn't start... I had that go out in my 96 jeep cherokee sport 4x4... changed the fuel pump out and then found out... I had it changed so I don't know how to do that part.... anyway hope that helps
good morning to you and welcome to fixya.com. hope we can get you fixed here. just a couple of questions first? have you changed the fuel pump yet? if so where did you buy the pump from? your pump is actually building up to much resistence and is unable to overcome it in turn no power is getting to pump as needed. i have a grand cherokee with 230k so i love hearing that you have that many miles. lets keep you rolling. let me know and ill help you out.
first, have someone turn your key on as you listen to the gas tank. you should hear a whirring sound that indicates your fuelpump is working. if not, check your fuses.2nd, change your fuel filter. good luck. if you don't hear any sound from your fuel pump and still after checking fuses, fuel pump may need to be replaced. good luck
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