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at 2k rpm the psi is at 15 what do you mean by deadhead pump pressure?

note: #1 should say 15psi not 51

Ok so here's the list of what I did last night following your suggestions. 1. at 2k rpm the fuel pressure holds at 51 psi 2. drove with O2 sensor removed. same problem occurs. jeep runs for a few minutes at 15 psi then the pressure drops off until engine dies out. 3. Once pressure started to...

yes I have. but I will try again. I have also checked and tested both of the rollover valves as well as replaced all the rubber tubing that plumbs them.

jeep is for off road use only. ;) I see fuel pressure drop on the gauge. It will start out strong at 15psi or more then after a few min of driving it will slowly drop off until it stalls. no fuel in oil...the engine is new has less then 100 miles on it

the pump is factory in the tank the wiring was also factory. Although I did hot wire it to a switch pulling power from the fuse block but the problem occurs either way. Also in reference to backpressure suggestion I am running without a cat. it was plugged so I replaced it with a straight pipe...

with KOEO the jeep holds rock solid at 15psi for more then 2 minutes no problem. Sorry I was out of town for a wile and couldn't try this until yesterday. when you say loosen the gas cap do you mean wile driving or with KOEO?

I've hade my tank off several times to change the pump I don't thing I have anything other then gas and a pump in there but at this point anything could be possible so ill check it out.

sorry I don't know what KOEO stands for. I'll try the loose cap idea although I have tested both of the roll over valves and they seam to be fine.

I have an 88 YJ with a 2.5L TBI. I am losing fuel pressure a few minutes after driving. I hooked a pressure gauge up to monitor the problem. it will idle at about 15 psi all day long but as soon as you start driving the pressure will gradually start to drop off until it stalls. I have replaced...