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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Fuel Pump!



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      02-17-2019, 10:56 AM   #1
Chris1337
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Fuel Pump!

get this on the idrive after a stage2 lpfp upgrade. any way to get rid of it? I know the car runs fine

cheers
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      02-17-2019, 03:39 PM   #2
MartinWake
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Cant see anything..
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      02-18-2019, 03:16 PM   #3
Chris1337
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Quote:
Originally Posted by MartinWake View Post
Cant see anything..
all it says is Fuel Pump! and I got my car in a lift in the instrument cluster when I turn off the ignition
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      02-18-2019, 08:09 PM   #4
deemarr 335i
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Can code it out, not sure how tho....its the stage 2 lpfp drawing more current than the ekp(fuel pump module) is programmed for. It's a normal message once you upgrade to stage 2 unfortunately.
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      02-18-2019, 09:02 PM   #5
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Post by Torr on "N 54 Tech" that explains how to code it out. Its a high voltage code.
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      02-21-2019, 03:16 PM   #6
Chris1337
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Quote:
Originally Posted by weehe126 View Post
Post by Torr on "N 54 Tech" that explains how to code it out. Its a high voltage code.
I've tried to do this myself, do you know anyone I can pay to do it?
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      02-21-2019, 03:45 PM   #7
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@Alex@Alpine does remote coding, maybe bimmerbeeks.net, and a few others on here can do remote coding, if you have the cables/etc.
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      02-21-2019, 06:11 PM   #8
Chris1337
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Quote:
Originally Posted by IllSic_Design View Post
@Alex@Alpine does remote coding, maybe bimmerbeeks.net, and a few others on here can do remote coding, if you have the cables/etc.
Alex told me he might be able to fix it for $50
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      02-21-2019, 09:03 PM   #9
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I had this code after installing the stage 2 pump on my late model 335i. I had someone code out the error but a couple months later the EKP module went bad. I believe it was due to stage 2 pump requiring more volts and the EKP was overheating. Not wanting to risk being stranded i put the original pump back in. BTW the stage 2 pump didn't help with my HPFP dipping below 2000 psi.
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      02-22-2019, 01:08 PM   #10
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Quote:
Originally Posted by FireBlaze View Post
BTW the stage 2 pump didn't help with my HPFP dipping below 2000 psi.
Yeah that's not the point of a upgraded LPFP, it is to make sure the lpfp sensor( ie the high pressure pump inlet) doesn't see less than ~55psi. If the hpfp is dipping too low it is either failing, can't keep up to what you're asking from it/you are running too high of an ethanol blend.
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      02-22-2019, 01:19 PM   #11
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Quote:
Originally Posted by IllSic_Design View Post
Yeah that's not the point of a upgraded LPFP, it is to make sure the lpfp sensor( ie the high pressure pump inlet) doesn't see less than ~55psi. If the hpfp is dipping too low it is either failing, can't keep up to what you're asking from it/you are running too high of an ethanol blend.
N55 doesn't have a lpfp sensor. Putting in a stage 2 pump, pumps more fuel to the hpfp so it is not starved of fuel, which causes hpfp pressure to drop. So a stage 2 pump can help a N55 hpfp.
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      02-22-2019, 02:06 PM   #12
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Quote:
Originally Posted by weehe126 View Post
N55 doesn't have a lpfp sensor. Putting in a stage 2 pump, pumps more fuel to the hpfp so it is not starved of fuel, which causes hpfp pressure to drop. So a stage 2 pump can help a N55 hpfp.
It's only going to "help" the hpfp if it was the stock lpfp that wasn't supplying enough pressure to the hpfp. If the stock lpfp is supplying enough pressure to the hpfp and the hpfp is still not keeping up, an upgraded lpfp will not help.
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      02-22-2019, 02:14 PM   #13
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Quote:
Originally Posted by IllSic_Design View Post
It's only going to "help" the hpfp if it was the stock lpfp that wasn't supplying enough pressure to the hpfp. If the stock lpfp is supplying enough pressure to the hpfp and the hpfp is still not keeping up, an upgraded lpfp will not help.
Since there is no LPFP sensor there is no way knowing if the LPFP is weak or the HPFP is weak. So it was simpler/cheaper to try the LPFP first. I am also running ethanol mix if that makes any difference.
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      02-22-2019, 02:37 PM   #14
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Quote:
Originally Posted by FireBlaze View Post
Since there is no LPFP sensor there is no way knowing if the LPFP is weak or the HPFP is weak. So it was simpler/cheaper to try the LPFP first. I am also running ethanol mix if that makes any difference.
I totally understand and makes sense. I didn't know the N55 didn't have an lpfp sensor, only knew about the z4 n54, when I first posted.
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      06-29-2019, 02:10 AM   #15
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Quick question.
My high pressure fuel pump readings are in the negative unless I really punch the accelerator
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      07-05-2019, 08:15 PM   #16
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Quote:
Originally Posted by chiralhomes View Post
Quick question.
My high pressure fuel pump readings are in the negative unless I really punch the accelerator
Negatives? Impossible, send a log of anything even idle
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