Fuel Pump Issue?

ivanwang811 · 10-12-2020, 10:37 AM

So I've recently noticed on my n54 e92 that the car has trouble starting whenever the fuel pump does not prime. It sputters for a couple seconds and I have to give it some revs to stay running but once it runs, it drives great. My question is should the car be sputtering just because the fuel pump does not prime? Every other time that the fuel pump has primed itself, it starts just fine. I included a log of my startup and this was when it primed. Will be back shortly to log the startup when it does not prime.

https://datazap.me/u/ivanwang811/sta...ata=3-13-21-22

Mustafa.e92 · 10-16-2020, 08:42 PM

Post the other log. Lpfp and hpfp look good in the log u posted.

mousefarmer · 10-17-2020, 10:39 AM

Lift your rear seat off, remove those metal covers for the fuel pressure regulator and pump and stick your nose in there smelling for fuel. If you smell fuel or gas then replace.

lookalikehuuh · 10-17-2020, 11:31 AM

The log you posted looks good, stable pressures and nothing out of the ordinary. If you have a log where the issue actually occurred that would be much more useful.

ivanwang811 · 10-21-2020, 12:15 PM

https://datazap.me/u/ivanwang811/3rd...ata=2-13-21-22

Here is a 3rd gear WOT
didn't rev it all the way up but I'm pretty sure the fuel pressures are normal?

BSM n54iS · 10-21-2020, 11:17 PM

I have a thread going with logs that are very similar to yours and I'm about to replace my hpfp because it looks like it's starting to let go.

ivanwang811 · 10-26-2020, 02:51 PM

Quote:

Originally Posted by BdSM n54iS

I have a thread going with logs that are very similar to yours and I'm about to replace my hpfp because it looks like it's starting to let go.

How are you actually determining that it is your HPFP though? I was told as long as rail pressure is >1500 on WOT you should be good.

BSM n54iS · 10-26-2020, 03:26 PM

https://www.e90post.com/forums/showthread.php?t=1767908

10-12-2020, 10:37 AM	#1
ivanwang811 New Member 3 Rep 20 Posts Drives: 2007 335i 6MT Join Date: Aug 2020 Location: Socal iTrader: (0)	Fuel Pump Issue? So I've recently noticed on my n54 e92 that the car has trouble starting whenever the fuel pump does not prime. It sputters for a couple seconds and I have to give it some revs to stay running but once it runs, it drives great. My question is should the car be sputtering just because the fuel pump does not prime? Every other time that the fuel pump has primed itself, it starts just fine. I included a log of my startup and this was when it primed. Will be back shortly to log the startup when it does not prime. https://datazap.me/u/ivanwang811/sta...ata=3-13-21-22
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10-16-2020, 08:42 PM	#2
Mustafa.e92 Lieutenant 206 Rep 498 Posts Drives: 2009 bmw 335i Join Date: Feb 2020 Location: Canada iTrader: (0)	Post the other log. Lpfp and hpfp look good in the log u posted.
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10-17-2020, 10:39 AM	#3
mousefarmer First Lieutenant 130 Rep 312 Posts Drives: 2007 328i, 2006 330i Join Date: Apr 2019 Location: N/A iTrader: (0)	Lift your rear seat off, remove those metal covers for the fuel pressure regulator and pump and stick your nose in there smelling for fuel. If you smell fuel or gas then replace.
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10-17-2020, 11:31 AM	#4
lookalikehuuh Major 700 Rep 1,228 Posts Drives: 2006 330i, 2007 335i Join Date: Sep 2014 Location: San Diego, CA iTrader: (0)	The log you posted looks good, stable pressures and nothing out of the ordinary. If you have a log where the issue actually occurred that would be much more useful.
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10-21-2020, 12:15 PM	#5
ivanwang811 New Member 3 Rep 20 Posts Drives: 2007 335i 6MT Join Date: Aug 2020 Location: Socal iTrader: (0)	https://datazap.me/u/ivanwang811/3rd...ata=2-13-21-22 Here is a 3rd gear WOT didn't rev it all the way up but I'm pretty sure the fuel pressures are normal?
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10-21-2020, 11:17 PM	#6
BSM n54iS Brigadier General 2685 Rep 4,202 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	I have a thread going with logs that are very similar to yours and I'm about to replace my hpfp because it looks like it's starting to let go. __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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10-26-2020, 03:26 PM	#8
BSM n54iS Brigadier General 2685 Rep 4,202 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	https://www.e90post.com/forums/showthread.php?t=1767908 __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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