I will still say it's the FP.
I would think it should give higher PSI than 40. Like 40-50.
What rpms did you test the psi at?
Run a 'hot' lead straight from the batt. POS.(+) to the POS.(+) on the FP.
IF, the engine still dies-----Gotta be the FP.
How is the FP grounded? Is it a dedicated ground to the frame?
BE CAREFULL !!!!
Did you ever open up that fuel filter like I asked you to do?
I just drove it around the block a few times to get a better handle on when its dying.
It'll idle just fine.
When in reverse, it dies about 3/4 of the time within the first 20 ft. Of backing up.
It died while coasting down a hill.
It sputtered when I punched it one time and died shortly after.
Also died when I put it in park right when I got home.
With what you say.
IF your Jeep was mine, and ALL the test'n you have done.
I would SWAG that there is an intermittent issue within the FP.
First call to FI maker again, and get the head tech. Refer him to this site.
Take notes on what he sez.......
See if they will send you another FP under warranty/good will.
I'm no wiz on FI, but 34-40psi doesn't sound like allot when my Subaru's run 50+psi rail pressure.
I think the pump is still under manufactuers warranty. I'll call them and see what they say.
I've spoken with the people who make the harness for the swap ( hesco) a few times and they are saying it has to be the computer because its throwing codes for components that don't exist like an ac clutch and electric fan circuit.
But according to the swap threads/ experts, all the computers throw those codes and they have none of the issues I'm having. Not to mention, the computer has thrown those same three codes since I've done the swap.
It's somewhat anti climatic after all the leads I've chased down, and can probably be attributed to my own ignorance or inexperience.
But after checking the fuel filter, I went to replace it with a new one. I was feeling around the wiring casing on the fuel pump wiring and felt a rough spot/ snag. Turns out, the wiring had rubbed against something and was almost rubbed completely through.
I fixed it, installed the filter and haven't had the problem since. I had previously checked the wiring, but hadn't felt the top of the casing, and this was out of sight.
Anyways, hopefully this thread can die now. I really, really appreciate all the help and advice.