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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Help low fuel pressure. Car died



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      10-13-2016, 02:21 PM   #1
Riceball777
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Help low fuel pressure. Car died

I have full bolts ons with hexon rr600 with a stage 2 e85 pump. Normally the Low fuel pressure is always at 67-69 psi and it never moves. But today the car died on me. I restarted the car and I realized the low fuel pressure was very very low. When at idle or light driving the low pressure starts at 60 psi but slowly will go down to 10psi and the car will die. This takes about 5-10 minute of the car being on. What's broken? What should I check? What should I replace.
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Last edited by Riceball777; 10-13-2016 at 03:22 PM..
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      10-13-2016, 02:39 PM   #2
FCobra94
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Prepare yourself for disappointment; could be a number of different things, but unfortunately, troubleshooting isn't easy:
http://www.e90post.com/forums/showthread.php?t=1309505
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      10-13-2016, 07:11 PM   #3
Riceball777
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Ok I was alone to limp the car 40 miles home. I kept the car off the freeways and since I have the JB4 Bluetooth connect kit so I was able to monitor the fuel pressure. The car would have a low pressure of 50-60psi and it would slowly go down to less than 20psi over the course of 10 mins. Then I would have to stop and restart the car and it would be back up to over 50psi low fuel pressure and do this all over again. But the last 15-20 miles of my drive the fuel pressure stayed constant at 60psi but would go down by the exact amount of boost. Meaning if I stab the gas and build 5psi the fuel pressure would drop from 60psi to55psi. Then would go back to 60psi after there was no more boost.

Does this mean the fuel pressure regulator is bad? since the the regulated is supose to increase fuel pressure by the same amount of boost.


Here is a pic of the low pressure dropping when only cruzing at only like 10% throttle



Is this what I need to buy to hopefully fix the problem?

https://www.ecstuning.com/BMW-E90-33..._3.0L/ES36230/
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Last edited by Riceball777; 10-13-2016 at 07:23 PM..
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      10-14-2016, 08:21 AM   #4
FCobra94
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Quote:
Originally Posted by Riceball777 View Post
Does this mean the fuel pressure regulator is bad?
I'd at least run the FPR INPA test before blindly switching it out though.
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Originally Posted by Riceball777 View Post
Is this what I need to buy to hopefully fix the problem?
https://www.ecstuning.com/BMW-E90-33..._3.0L/ES36230/
Yas
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      10-14-2016, 08:29 AM   #5
mojobmw_e90
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I'd first so a good inspection of the fuel pump assembly itself and make sure it doesn't have cracks and such. Also check the feed line that connects to the pump and make sure it still have a o ring inside and that it seats right onto the nipple.
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      10-14-2016, 09:37 PM   #6
Riceball777
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Quote:
Originally Posted by mojobmw_e90 View Post
I'd first so a good inspection of the fuel pump assembly itself and make sure it doesn't have cracks and such. Also check the feed line that connects to the pump and make sure it still have a o ring inside and that it seats right onto the nipple.
I pull out the fuel pump as well as the fuel filter/fuel pressure regulator assemble and everything looks normal to me.
so i dont know. I just bought a new fuel pressure regulator/fuel filter assembly from ecs. It should be here in a few days so i hope it fixes the problem.
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