Ok, George - I responded Thur 22nov with probable cause and test method -
gmctd wrote:
I'd say the pre filter - but, put a fuel gage in line on the pressure side, see if it pumps ~5psi avg
I responded again with concept and result -
"The concept is beautiful, George - pressure-ize a simple system, and the pressure will be equal at each point in the system.
72gph at 72mph is 1mpg
A fuel pressure guage trumps opinion - put a 20buck guage from autozone on it, post your results, and then we can diagnose any problem"
I responded again with data and test -
"Yes - your "At idle, opening the bleeder screw exhibits exactly what I'd expect: there is positive pressure in the filter, and fuel dribbles out the bleeder." tells the tale - at 5psi lift pump pressure, everything east of the fuel manager head should be quickly drenched with Diesel fuel, not just a dribble, depending on your perspective to 'open'.
5psi at lift pump = 5psi at fuel manager head input = 5psi in filter element = 5psi at bleeder valve = 5psi at fuel manager output = 5psi at CP3 input
5psi @ 72gph?
72gph @ 72mph = 1mpg, no matter how you cut it - your 2.8L engine would barely consume 72gph at WOT for an hour - I would venture out on a limb, here, and say it will consume much less at idle.
Seems to me as tho you do need a fuel guage on it, eh?
I do see one reference to the P74029 for 2-3psi @ 16gph - still should keep up at idle"
I responded again with direct example for testing -
"The facts, ma'm - just the facts.............
22bucks, autozone
20bucks, jcwhitney
220bucks, jcwhitney, my personal favorite "
I responded Sun 25Nov with two test methods -
"Put a hose on the bleeder valve nipple - other end of the hose in an empty clear water or coke bottle - open the bleeder - turn the key to ON-OFF-ON, lift pump will run 22 seconds - 70gph, no head, that lift pump should fill that 16oz bottle in ~10 seconds .
**********************************OR***********************************
Place either of those guages on the bleeder nipple - anything above 0 (Baro) is +pressure - anything below 0 (Baro) is -pressure, or vacuum, since indications on that guage will be guage pressure, or psig, based on local ambient Barometric Pressure
1rst method you're still guessing
2nd method is just the facts"
I'm absolutely stumped, George - you've chosen to ignore my response, and refused to test anything - I absolutely do not know how to help you, at this point - I do know that sitting and reading thru responses will not heal your Jeep - you have to get outside, pop the hood, and apply a little elbow grease to get the job done.
So, I will repeat myself for the at least the fourth time in this thread - with a 30 psi guage the in-tank pump gives steady 9psi pressure at the fuel manager head.
Key On, engine off the needle flashes toward 30psi, then steadies out at 9psi
Key On, engine idling, 10mm3 fuel rate, 4500psi rail pressure = steady 9psi
Key On, 3500rpm rev from idle, fuel rate 70mm3, 22000psi rail pressure = steady 9psi
Key On, 3500rpm leveled out, fuel rate 60mm3, 18500psi rail pressure = steady 9psi
Key On, engine idling again, fuel rate 10mm3, rail pressure 4500psi = steady 9psi
Now - shame on me if I again suggest you go out and hose your system or guage your system to find out what's really wrong with it, instead of wild a** guessing and surmising till the end of the year, but, here it is:
Go out and hose your system, or guage your system, and tell us why yours is the only one that has not responded to auxilliary lift pump installation, out of the ten or so that have done so and succeeded.
That's all I have to offer, George - here it is 4days later and yours is still not functional, and you're still refusing to go out and test it - is it you, or is it me?