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Peter Rutesic

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  1. Moses, thanks for your detailed and quick response. I forgot to mention that this engine was rebuilt a year ago. O2 sensor is brand new NTK. All other sensors have been tested either with OBD tool or with scope and seem to operate properly. In some cases I had spare ones that return same values. Based on part number I installed proper fuel pump. I tested for bleed down and it held pressure for more than 30 mins. I will preform the test at fuel filter. Can I simply remove fuel filter and put tee instead of it? What bothers me is that with both old and new regulator there is fuel odor in vacuum line to the regulator. It is not extremely strong but definitely present, so I'm not sure if that is a sign of leak... With old regulator (factory installed one) long ft numbers were around 3-4%, while with new one that went higher. I'm not 100% sure but I think that with old regulator fuel pressure was close to 30psi. I replaced it because I could smell fuel odor in vacuum line and because I replaced fuel pump before that but pressure stayed below 31psi. I could not see any fuel dripping out of it. Another thing worth mentioning - when I first installed new regulator, on idle it was sitting at 37psi with vacuum line either connected or disconnected. I checked line multiple times but it was ok. Then after some driving it went down to current pressure. Could this be that this regulator is bad from the factory? Maybe it was not calibrated properly. I will again do smoke test. Last time I did it only place I could see smoke coming out is throttle body shaft but I guess that this leak can be compensated by IAC motor. If I hook up jeep to OBD tool, I can see that IAC steps are 7 on hot idle, not sure if this is normal.
  2. I'm trying to nail this down but unfortunately without any success. Jeep has around 27-9 psi pressure at rail at idle and vacuum connected. With disconnected vacuum it is around 36psi. I think this is main issue why my fuel trim numbers are 5-8%. Things done so far: Fuel filter has some 3k miles on it. Bypassed fuel filter and pressure is still the same. Cleaned and tested fuel injectors. All tested good. Checked vacuum lines Fuel tank had to be dropped for skid replacement, so I replaced fuel pump at the same time /w new strainer Replaced fuel pressure regulator with both o-rings Biggest difference happened when I replaced fuel pressure regulator. Vehicle would start around 30psi and will slowly drop down after warm up. I can't see any fuel dripping from regulator but I can smell fuel odor in vacuum line elbow. Smell was there even with the old regulator, I thought that it had shot diaphragm and replaced it. I really don't know where to look next, as I can't really see any fuel leaks and fuel consumption seems to be around normal...
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