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LPFP PSI Exceeding 72PSI. Halp Pls.
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03-15-2014, 12:01 PM | #45 | |
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Are you running a piggyback or just the cobb? |
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03-15-2014, 05:28 PM | #46 |
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stock lpfp and cobb only ran the car today and at idle it was 72 again and bouncing from high 50's all the way up to 100 not sure seems to be e85 related when i went stock a few weeks back it seemed fine for the most part .keep thinking i just need a new lpfp or install the inline been waiting on steves set up or i think it was tundra making one with the 455 not sure what to do yet but the car seems fine other than random high idle 800 rpm .
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03-22-2014, 09:31 PM | #47 |
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Well Steve's inline pump was swapped in last night for the FFTEC pump...absolutely zero difference. Actually, now it's a bit worse, as the car pegs high 80s PSI under all but light load. Driving around under light load fuel pressure is perfect, 72PSI flat. But give it some load and the car loses all ability to regulate it. At this point there are only 2 parts in the fueling system left to replace, the filter/pressure regulator, and the EKP module or whatever that thing is. I am at a total loss, it's clearly not the pump as swapping made no change there. I hate my car right now.
Edit: I should add, Steve's pump is really well put together. Install couldn't have been easier.
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03-22-2014, 09:46 PM | #48 | |
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03-22-2014, 09:59 PM | #49 |
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Yea at this point it can't be anything else that I can think of. I'll check the regulator first, shouldn't be too bad to get to and the part is cheap.
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03-22-2014, 10:36 PM | #50 |
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Can I ask you again why you are worried about this. I purposely run my lpfp at 80+ psi at idle as that's where I want it, all that fuel pressure means if what the HPFP is seeing and can use. It has nothing to do with that your engine is seeing. If you really really want it back to 72 I said in a bunch of posts back that's it prob the fuel controller in the kick panel, that controls your PWM.
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03-22-2014, 10:49 PM | #51 | |
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09-09-2014, 05:21 PM | #52 | |
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It could be that new stock pumps got upgraded now. BTW I am fbo with meth running 15deg monster Wedge flash. And new stock pump from ECS tunning runs great. |
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09-09-2014, 05:53 PM | #53 | |
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Now just need to get the high pressure side to stop nosediving down low. Tonys HPFP cant come soon enough! |
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09-19-2014, 12:25 PM | #55 |
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I've been running this setup for almost a month now and have the same mindset as Tony. However since you said yours started happening a month in I'll be on the lookout, where is this fuse at again?
Also Andrew, just got an e50 tune done by Jake and wow, I know what you meant after your test drive with him earlier this year.
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09-19-2014, 01:26 PM | #56 | ||
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You should be fine, for whatever reason my car wanted to pull justttt over 20 amps. And nice! Yea it's completely different once you get some octane in the mix. Stock frames are hungry for it.
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09-19-2014, 01:41 PM | #57 |
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Here are my logs for comparison:
http://datazap.me/u/umich335i/140917...=0&data=2-3-14
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e50 PTF Protune | Cobb FMIC | aFe DCI | VRSF DPs | ER CP | Tial BOV | Alpina Flash | Fuel-It Stg1 | RB PCV | Cobb Exhaust |
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09-19-2014, 03:33 PM | #58 |
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My kit from SteveAZ was doing the same thing, about 83 PSI constant except under load until I replaced the fuel filter in the driver side of the tank which also replaced the pressure regulator, and blowing out the entire fuel tank vent system and hose clamping the connector that connects to the LPFP top hat (the black vent hose that connects to the elbow that has the nasty clip on it), then my fuel pressures went back to around 70 PSI and down into the low 60's heavy under load (E35 mix on E30 cobb map) (which first made me think both the pumps were not working, so I double checked that and they indeed are both working).
Here's the part number for what I replaced: 16117163295 (note there is a second part number for this "kit" as well: 16147163296, but that kit is for LCI cars, the one ending in 5 is for pre-LCI cars) |
02-29-2016, 01:18 PM | #59 |
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Bump! Having an identical issue with Fuel-It Stage 2 LPFP. Pressure is a cool 72-73psi all the time, then after I go WOT it is a constant 84-85psi until restart. LPFP sensor is new.
Thinking of upping the fuse size (not sure how this would play into fuel pressure) and/or replacing the filter/regulator assembly on the driver's side of the tank.
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02-29-2016, 10:01 PM | #60 | |
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03-01-2016, 09:06 AM | #61 | |
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To be clear; replacing the fuse didn't change anything with regards to fuel pressure. It was an important fix for me, but was done independently of fuel pressure matters.
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03-01-2016, 12:33 PM | #62 |
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So what exactly did you change to notice the difference?
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03-01-2016, 01:06 PM | #63 |
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I didn't change anything. The car is running as a deadhead setup right now with twin walbros on the low pressure side. It runs 80+ PSI at idle.
No issues.
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08-05-2020, 08:05 AM | #64 | |
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The car runs great, no issues, no blown fuses....... Do I need to worry about this at all? From the searching I've done....this is very common. I open some old logs from when I had the stock LPFP....and it did the same thing. |
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08-05-2020, 10:31 PM | #65 | ||
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08-07-2020, 01:14 PM | #66 |
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My low pressure does dip to the 80's also at certain occasions and even 90 psi for a split second when I shift to the next gear. I think its normal to be honest. It's just a healthy strong pump working and getting regulated back to normal pressures. My log also shows 80 psi when I'm driving normal. I'm running the BMP Stage 2 bucket-less.
https://datazap.me/u/n54tt/mhd-stage...0&data=3-11-20
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