Your welcome for the reply. Thank you for the updated information as well. I'm sure that this problem would be one of those drivability problems where a diagnostic shop would run up a bill on dynometer time and offer to change the fuel pump and do further testing to see if the glitch and electrical overdraw still exists. The end result is $$ and no one will give a definitive answer until they perform the service. That leaves you being asked to agree with the diagnostic checks and no promise that the solution will be found. They will of course tell you they strongly believe what the cause is but can't confirm it until they get their hands on your jeep. Not to say they're is any dishonesty to start with but when they cannot support or justify their work and labor rate , that leaves you stick with the note. This happened to my dad with an E class Mercedes Benz once. He did get restitution but hassled and haggled over the bill. I don't want this to happen to you and I respect you turning to this forum ( or any other ) for your answer. Respecting your research and doing your homework , I'm only trying to draw from my experience as well. The only facts I can give from your up to date description of the problem leads me to believe the problem of fuel pressure is second to the electrical problem. In my mind , I'm thinking it sounds like some kind of restriction causing the fuel pump to work harder and drawing more amperage than normal which is causing a " blackout" in the wiring harness at triggers the ASD to shut down the engine . Even if a wiring diagram were to show the relationship of the wiring that is ganged together in the relay circuit ( a power circuit used to power the relay coils of several relays in a row) it's meaningless if the wiring is in good shape . This is only the effect that the relays are hot to touch due to the overdraw . You want the cause and need assistance to find it. I wish not to just appease you by understanding your grief and listening to your description of the problem but a solution would be good , agreed. Not for the sake of bragging rights do we want your jeep fixed but I hate when these things happen and are difficult to nail down. The only suggestion I have to offer is a righteous amperage test be performed to prove if/that an/a overdraw exists. That is the only way that one can proceed toward a repair. Before that however , it needs to be proven if a restriction in the fuel system in fact exists . Your fuel pump has not died altogether showing that replacing it may or may not be the answer. I realize there is a difference in design and that needs to be taken into consideration with regards to the check for fuel system restriction. If there is a restriction , where does it exist ? You already did the sensible thing of swapping the filter to eliminate that from the equation . Now , is the pressure at the rail acceptable is one question and is the pressure from the pump within range since pressure is normally lost from the pump to the rail. It has to be acceptable a loss to operate the system right however. If you think that speaking to someone at a trusted diagnostic center for known and proven case studies of this problem in your model and similar will help , that is a start. Also , if any Chrysler service bulliitins of this nature exist , that is more support toward a solution. I wish not to turn this post into a novel as I easily can but to offer a next step . Finding if a restriction exists and obtaining an amperage reading of the electrical draw the fuel pump is pulling to compare to normal draw readings. That I believe is what should be done after the Chrysler bulliitins are researched. If this happened to your jeep , it can't be an isolated incident. If your lucky , maybe a clogged pick up filter is the cause . Of course the tank on a grand Cherokee must be dropped and the fuel pump module is removed with special tools ( people makeshift this procedure though) but there is that to do just to find out if the pick up filter is the cause. I hope this post helps you to find the problem and hope that my offerings contribute to a real solution. Did I mention hard case drivability problems ? Who dosen't. A hard core tech invites them but Us diyer's are only so equipped. It's no fun when your under the gun. Hope for a solution to be found soonest for you . Thanking you for sharing this with us but sorry it's under these circumstances.
