i have a 1994 wrangler with the 2.5 and it starting to get me upset

it starts fine, but after about 5 min it starts missing ang back fireing so i put a fuel pressure gadge on it and at startup its got about 30 to 35 psi but it losses pressure to 0psi when you give it gas so i replaced the fuel pump did not help so i replaced the aic motor o2,fuel filter, pressure regulater, fuel cell vents, and lines,plus the cap,rotor,plugs,wires,and coil,

this jeep is my main transportation and it been down for about 6 months please help

ive read alot of the other post and checked the stuff that they said but no help

So does it still lose pressure to ZERO? Or what?
Seems all you need is a dist pickup and a sparkbox and you will be all new in there.. Does that engine have a CPS?
Backfire usually means loss and regaining spark..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

yes it still losses pressure ive check the timing and its dead on. if i plug off the fuel rail return and the fuel pressure gose to 80psi but i only did it for a sec in fear the i might blow something up.

oh and i did replace the pick up dick but it did not fix anything so i took it back (what is a cps?) <img src="/forums/images/graemlins/confused.gif" alt="" />

you have alot more newer systems than my CJ, but I pulled my hair out for months facing the same thing you are, eventually it went from backfires to stalls a couple minutes down the road. I replaced most of the stuff you did. turned out to be my MSD spark box which wasn't all that old, so I it was the last thing I checked

yea ive checked all the ez stuff and still nada. but yea if you try to go anywhere it sometimes it takes 10 miles sometimes it takes 1/4 mile and it losses all fuel pressure i just dont know what or how to check anything, like i read there is a resister that i can check well i couldn't find it so i rewired the fuel pump to a switch 12v and that did not work. so what would do that?????????? even with the fuel pump wired to the bat it did it. so im lost <img src="/forums/images/graemlins/scared.gif" alt="" />

Dude we are trying to tell you...backfires are caused by a loss of spark!
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

i understand but everything is new its all been replaced and that dose not tell me y the loss of fuel pressure.big jim is there a resister for the fuel pump if so where is it
i just replaced the cps and it still doing it

i started lookin throu the other post and the guy NOBULL had the same prob or at least close. and there is no more back fire just the loss of pressure. so that is 1 prob down 1 to go. basicly after a few mins of drive time it acts like it runs out of gass when you put your foot in it and if you back off it picks up the pressure and starts to go for a little while mostly at higher rpms and in gear sometimes it will do it when im sitting still and rev it. i hope this helps

One possibility would be the new filter is already stopped up. Another might be a badly crimped fuel hose. Another might be the wrong gas cap..have you tried taking it OFF and driving?
Also Wranglers have had problems in the past with the GROUND to the fuel pump..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />