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Power Strokes
6.4 Tech
Rail Pressure Oddity
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[QUOTE="Black AOD, post: 1403797, member: 16536"] So my truck has been seeing a small and odd fluctuation here and there in rail pressure recently. I noticed it about 2-3 weeks ago, after idling for about 10 minutes and then leaving to go to work, I'd get out on the road and get into the throttle and it would go and then for a few seconds it didn't really want to fuel and rail dropped to 2.2k psi for about a tenth of a second and then the pressure spiked and it was fine and then a second or two later it did it again. Then the rest of the day it was fine. Exact same thing next morning except it only dropped to a low of 4.4k PSI then it was fine all day. It had a really small drop during throttle going over a bump later that day but cleared right up. Nothing else after that. My truck uses an Aeromotive lift pump so I changed the CAT filter about a week ago since it had about 8k miles on it and they do fuel filtration/water separation all in one and since then no issues at all until today. I hit a bump this morning kind of hard on my way into work and when i was coming out of a stop sign it didn't want to fuel as hard down low and rail wouldn't maintain, then again a few seconds later, then it returned to normal. Then I was driving home from work and going up a slight incline on the highway it started to not want to fuel as hard and rail dropped from about 10.5k psi to 9.0k PSI and then it spiked back up. Did it again a few seconds later and the the rest of the drive home it was fine. I'm at a loss. I spoke to Morgan @ Midwest a bit ago and he agreed it's weird. I have zero fuel leaks. The truck on the big tune which makes 850+ holds 24.5-25k PSI in WOT pulls and even did a few 4wd boosted launches to test it. RP holds steady at 24.5+ consistently. It makes 6k rail pressure @ Idle, doesnt smoke out the tail pipe any more than normal, RP graph on the H&S doesnt show anything out of the ordinary. My personal thoughts/consensus is a rail pressure sensor is going bad, a regulator is sticking, a PCV on one of the k16's is malfunctioning, or one of the k16's is going bye bye. Any thoughts or input would be appreciated. For those who don't know my setup, basic list is below. Motor is almost fully built minus it doesnt have billet rods. Midwest Diesel 5R Billet Comp Trans Midwest Diesel Dual Fueler K16 Kit Elite Diesel 2.0 High Power Compounds Elite Diesel Stage 3 Low Pressure Fuel System RCD 60% Injectors Both K16's are used OEM pumps. NOT REMANS. They have fairly low miles on them. [/QUOTE]
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