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Old 04-11-2018, 06:17 PM   #151
undyjr
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I can't run E70 or higher without running out of fueling. That's with an AEM in tank pump and water meth port injection. I'd REALLY like a better HPFP.
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Old 04-12-2018, 07:35 AM   #152
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i don't think mine is anything to do w ethanol at all. but i had my AP on for startup, fuel pressure is 53, but it ramps to almost 1000 in a split second when the starter button is pressed.
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Old 04-12-2018, 01:04 PM   #153
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Quote:
Originally Posted by jobber View Post
i don't think mine is anything to do w ethanol at all. but i had my AP on for startup, fuel pressure is 53, but it ramps to almost 1000 in a split second when the starter button is pressed.
Cold starts on ethanol are always typically longer. May not be what is happening here. If my car was not in the garage overnight and lower than 50 degrees it was always hard to start.
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Old 04-12-2018, 01:09 PM   #154
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Quote:
Originally Posted by ericdet View Post
Cold starts on ethanol are always typically longer. May not be what is happening here. If my car was not in the garage overnight and lower than 50 degrees it was always hard to start.
i am always in garage at night.
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Old 04-12-2018, 02:50 PM   #155
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Quote:
Originally Posted by jobber View Post
i am always in garage at night.
cold start with high ethanol content = **** atomizing.
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Old 04-18-2018, 11:22 AM   #156
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Interesting article around this topic:
http://www.enginelabs.com/engine-tec...inner-crowned/
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Old 04-18-2018, 03:05 PM   #157
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Quote:
Originally Posted by Perscitus View Post
Interesting article around this topic:
http://www.enginelabs.com/engine-tec...inner-crowned/
Cool article, thanks. Makes me feel better about running water meth and flex fuel. I'm curious if my MS109 tune will be worth it.
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Old 06-11-2020, 11:10 PM   #158
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Hate to bump an old thread, but I have been running around e60 for the past year - 15k-20k miles. I've cycled 91 a few times throughout the year, but probably have gone about 8k miles without. At first I was losing fuel pressure up top, going from 2300 psi to 500 psi during WOT. I figured it was my LPFP going out, so I took out my DW300c and reinstalled it.

Now I am dealing with a different issue of my fuel pressure dropping to ~50 psi whenever I take my foot off the accelerator. This happens while coasting on the highway. Idle fuel pressure is normal, and so is my fuel pressure when accelerating. Is this a sign of my HPFP sticking? I just filled up with 91 to see if that will relieve the issue. Haven't done too much WOT since I don't want fuel cut and my engine to go kaboom.

Currently at about e20, since I filled up with a quarter tank of e50.

edit:
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Old 06-11-2020, 11:43 PM   #159
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Quote:
Originally Posted by clintokada View Post
Hate to bump an old thread, but I have been running around e60 for the past year - 15k-20k miles. I've cycled 91 a few times throughout the year, but probably have gone about 8k miles without. At first I was losing fuel pressure up top, going from 2300 psi to 500 psi during WOT. I figured it was my LPFP going out, so I took out my DW300c and reinstalled it.

Now I am dealing with a different issue of my fuel pressure dropping to ~50 psi whenever I take my foot off the accelerator. This happens while coasting on the highway. Idle fuel pressure is normal, and so is my fuel pressure when accelerating. Is this a sign of my HPFP sticking? I just filled up with 91 to see if that will relieve the issue. Haven't done too much WOT since I don't want fuel cut and my engine to go kaboom.

Currently at about e20, since I filled up with a quarter tank of e50.

edit:
Protuned and modded
Nvidia catless j pipe
q300 catback
ebcs
prl fmic
cobb flex fuel
ibr full tgv deletes
egr deletes
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Let the car sit overnight and then see how much fuel pressure you have on key on in the morning. Should be around 50-60 IIRC. This rules out any lpfp issues. Easy thing that should be checked first.
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Old 06-12-2020, 11:54 AM   #160
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Just checked it. Fuel pressure was at 58 psi when I turned the key to the "on" position. Did not turn the car over.
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Old 06-12-2020, 12:15 PM   #161
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Is this happening only with ethanol blends or 91oct too? When did you first notice it and how?Was it after cycling 91?

I am on e50 for 22k miles straight so far, no cycling and no issues. Wondering if its just a matter of time or vehicle specific. I also use top lube but minimally, not as recommended. Like 1/4-1/2oz per fill up, roughly, on most fillups. Dunno if it helps except my peace of mind.

I did hear an electrical dc voltage kind of hum noise at first when running e50, i always thought it may be hpfp related. Really faint sound/hum. It went away and i am not hearing it anymore.

Hope you get it resolved, must be frustrating.
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Old 06-12-2020, 12:57 PM   #162
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Just posting my thoughts. Been running straight E85 with the Nostrum HPFP for a while with no issues. Cold starts are still rough though.
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Old 06-12-2020, 05:19 PM   #163
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Quote:
Originally Posted by Rexy18 View Post
Is this happening only with ethanol blends or 91oct too? When did you first notice it and how?Was it after cycling 91?

I am on e50 for 22k miles straight so far, no cycling and no issues. Wondering if its just a matter of time or vehicle specific. I also use top lube but minimally, not as recommended. Like 1/4-1/2oz per fill up, roughly, on most fillups. Dunno if it helps except my peace of mind.

I did hear an electrical dc voltage kind of hum noise at first when running e50, i always thought it may be hpfp related. Really faint sound/hum. It went away and i am not hearing it anymore.

Hope you get it resolved, must be frustrating.
Just started happening, I just put in 91. Now my blend is at e20. Going to drive through the tank and see if it resolves the issue. Hoping it does, either that or else I will be purchasing a new HPFP. I’ve been emailing my tuner logs, hoping to get this resolved. Can’t find anything on the forums or online with anyone that has a similar problem like mine.

The fuel pressure drops all the way down to 50-60 psi when I take my foot off the throttle. It will stay there till I apply throttle. So if I’m coasting, I’m coasting at like 50-60 psi. This happened on e62, e50, and now e20. Haven’t done any WOT, but my fuel pressure seems pretty normal otherwise.
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Old 06-12-2020, 07:03 PM   #164
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I just took out my dw300c and put in an aem 340lph. I’ll update you guys on if that had any effect. It seems like my fuel pressure mins are getting higher, but it could be a coincidence from lowering the ethanol content.
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Old 06-12-2020, 10:28 PM   #165
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Quote:
Originally Posted by clintokada View Post
I just took out my dw300c and put in an aem 340lph. I’ll update you guys on if that had any effect. It seems like my fuel pressure mins are getting higher, but it could be a coincidence from lowering the ethanol content.
I was wrong earlier. The checking fuel pressure thing was only to diagnose a seating/o-ring issues. So hopefully this fixes it!
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Old 06-12-2020, 10:43 PM   #166
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Changed out my LPFP to the AEM, pretty similar results. While doing city driving, my fuel pressure minimums seemed to go up a little after the switch. However, the minimum pressures went back down to double digits again while driving on the highway.

Why does my fuel pressure stay normal when I am in neutral or with my clutch engaged at a full stop? But when my pressure drops when driving highway and take my foot off the throttle? Is there something different?
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Old 06-13-2020, 12:17 PM   #167
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If it's dipping to 40-50psi it's your HPFP. Chopping the throttle will piss it off and make it stick when it's already being temperamental/hotter, I figured that out in 2016. I believe the tolerances are so small, that's why you probably have problems when the engine is being run with more demand/temperature.
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Old 06-13-2020, 12:48 PM   #168
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It doesn’t matter what my oil temps are, or whether my car is cold or not. The psi will drop to double digits unless I push in the clutch or go into neutral. Anyone have any luck with the nostrum HPFP?
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Old 06-13-2020, 01:59 PM   #169
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Originally Posted by clintokada View Post
It doesn’t matter what my oil temps are, or whether my car is cold or not. The psi will drop to double digits unless I push in the clutch or go into neutral. Anyone have any luck with the nostrum HPFP?
I don’t think the oem one is too expensive, so I would go that route and try and run a few more tanks of 91-93 to keep it happy.
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Old 06-18-2020, 01:24 PM   #170
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Old 06-18-2020, 01:25 PM   #171
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Sorry for being captain obvious. I was complete blind to the original date of the thread and someone revived it.
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Old 09-11-2020, 10:00 AM   #172
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Quote:
Originally Posted by clintokada View Post
It doesn’t matter what my oil temps are, or whether my car is cold or not. The psi will drop to double digits unless I push in the clutch or go into neutral. Anyone have any luck with the nostrum HPFP?
I am having the exact same issue. I’ve replaced the lpfp and reinstalled 3 different times and the issue still persists. Only time the pressure drops is while coasting in gear with the foot off the gas. I’ve also started noticing a rough idle with occasional cylinder roughness. Did you ever figure out the problem? I just ordered a new hpfp.
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Old 04-14-2021, 01:43 AM   #173
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Originally Posted by Zackcaz27 View Post
I am having the exact same issue. I’ve replaced the lpfp and reinstalled 3 different times and the issue still persists. Only time the pressure drops is while coasting in gear with the foot off the gas. I’ve also started noticing a rough idle with occasional cylinder roughness. Did you ever figure out the problem? I just ordered a new hpfp.

You ever figure this out? Started happening on mine recently
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Old 04-19-2021, 09:26 PM   #174
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Default E85 DI high pressure fuel pump

I'm tuned for E60, but after the second tank of E60 my HPFP started acting up, so I've been on E50-E55 exclusively, since I'm tuned on E60, am I okay to just stay on my E60 map or should I tell my tuner to revise it for E50? (I was dyno tuned flex fuel for E60)

Last edited by OHHFSHO; 04-20-2021 at 09:34 AM.
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Old 04-20-2021, 08:00 AM   #175
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Originally Posted by OHHFSHO View Post
I'm tuned for E60, but after the second tank of E60 my HPFP started acting up, so I've been on E50-E55 exclusively, since I'm tuned on E60, am I okay to just stay on my E60 map or should I tell my tuner to revise it for E50? (I was dyno tuned for E60)
Are you tuned for flex fuel? If not you should be...
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