LPFP Reading 134 psi at idle

JStang · 01-28-2015, 09:57 AM

About a week ago, I installed the Fuel It stage 2 pump and everything has been running very smoothly. About 10 minutes into my commute to work this morning I looked down at my Cobb AP and noticed that the LPFP was at 134 psi at idle

. I hadn't taken the car past 3k RPM's.

I looked at the codes and the always present 2AAF was there (no big deal) and I also had code 2A2D present.

2A2D - fuel low pressure system, fuel pressure

What could be causing this? My initial thought is my LPFP sensor is on the way out. I replaced it about 2 years ago but I'm definitely not ruling it out. I remember that when the sensor was done I got code 29F3 and pressure would read 145.01 at all times.

I already contacted Steve to get his thoughts but wanted to see if you guys had any experience or input.

135Pats · 01-28-2015, 10:54 AM

Could be the sensor, when it goes things get cray. My car has always pegged LPFP PSI a bit high, had a ridiculous saga with it last spring that Steve was able to tackle.

Does it spike there? Or it is just pegging that.

JStang · 01-28-2015, 10:55 AM

Quote:

Originally Posted by 135Pats

Could be the sensor, when it goes things get cray. My car has always pegged LPFP PSI a bit high, had a ridiculous saga with it last spring that Steve was able to tackle.

Does it spike there? Or it is just pegging that.

On the drive in, it was staying pretty steady at 134 (+/-) 10 psi.

135Pats · 01-28-2015, 11:10 AM

Quote:

Originally Posted by JStang

On the drive in, it was staying pretty steady at 134 (+/-) 10 psi.

Sensor or FPR going out? That would be my guess. I'd wait for Steve to chime in, you can spend months chasing ghosts with fuel issues, and the only result is a sad wallet. I replaced my HPFP, LPFP, LPFP Sensor and went through 2 Walbros before figuring out it was just the damn 20amp fuse....A $2 fix.

Tiago@VRSF · 01-28-2015, 11:24 AM

Sounds like the sensor is failing.

JStang · 01-28-2015, 11:24 AM

Quote:

Originally Posted by 135Pats

Sensor or FPR going out? That would be my guess. I'd wait for Steve to chime in, you can spend months chasing ghosts with fuel issues, and the only result is a sad wallet. I replaced my HPFP, LPFP, LPFP Sensor and went through 2 Walbros before figuring out it was just the damn 20amp fuse....A $2 fix.

I remember when you were having that fuse issue. Anything fuel related, Steve is my go to guy!

JStang · 01-28-2015, 12:28 PM

Got in the car to go to lunch and LPFP is pegged at 145 and code 29F3 is now showing up. Looks like it's time to replace the sensor again after 2 years. could be worse!

the other codes are gone.

C.Pop · 01-28-2015, 06:21 PM

Generally when LPFP reads something high as a flatline, that means your sensor is junk. It's a pretty easy fix.

Julian2485 · 01-28-2015, 06:41 PM

Quote:

Originally Posted by 135Pats

Quote:

Originally Posted by JStang

On the drive in, it was staying pretty steady at 134 (+/-) 10 psi.

Sensor or FPR going out? That would be my guess. I'd wait for Steve to chime in, you can spend months chasing ghosts with fuel issues, and the only result is a sad wallet. I replaced my HPFP, LPFP, LPFP Sensor and went through 2 Walbros before figuring out it was just the damn 20amp fuse....A $2 fix.

Where is this fuse located

Dmacc · 01-28-2015, 07:59 PM

Quote:

Originally Posted by Julian2485

Quote:

Originally Posted by 135Pats

Quote:

Originally Posted by JStang

On the drive in, it was staying pretty steady at 134 (+/-) 10 psi.

Sensor or FPR going out? That would be my guess. I'd wait for Steve to chime in, you can spend months chasing ghosts with fuel issues, and the only result is a sad wallet. I replaced my HPFP, LPFP, LPFP Sensor and went through 2 Walbros before figuring out it was just the damn 20amp fuse....A $2 fix.

Where is this fuse located

+1?

Welterweight · 01-28-2015, 08:04 PM

My psi reads zero on occasion and code came up saying fuel sensor electric. Pretty straight forward right guys? Time for a new sensor.

JStang · 01-29-2015, 08:29 AM

I put in the new sensor last night and problem solved.

Welterweight · 01-29-2015, 09:01 AM

Trickey install?

JStang · 01-29-2015, 09:33 AM

Quote:

Originally Posted by Welterweight

Trickey install?

Not too bad. I saw one guy say he can do it in 20 minutes. I call BS on that. Definitely doable in an hour or so though.

Remove Intake
Remove Charge Pipe
Remove Throttle Body
Remove Junction Box
Pop off Connector (toughest part IMO)
Remove Old Sensor

KeepRidingDirty · 01-29-2015, 10:25 AM

Took me about an hour. Easy just stuff to remove.

135Pats · 01-29-2015, 12:21 PM

Quote:

Originally Posted by Dmacc

+1?

Fuse box behind the glove - there's a latch on the 1 series on the left hand side that you need to depress to drop the glove. Be careful or it'll slice your finger really nicely (ask me how I know).

Fuse 70 or 71, I can't recall. Easy work.

Dmacc · 01-29-2015, 12:37 PM

Quote:

Originally Posted by 135Pats

Quote:

Originally Posted by Dmacc

+1?

Fuse box behind the glove - there's a latch on the 1 series on the left hand side that you need to depress to drop the glove. Be careful or it'll slice your finger really nicely (ask me how I know).

Fuse 70 or 71, I can't recall. Easy work.

Thanks for the tip!

Nugget · 01-29-2015, 08:03 PM

Quote:

Originally Posted by 135Pats

Fuse box behind the glove - there's a latch on the 1 series on the left hand side that you need to depress to drop the glove. Be careful or it'll slice your finger really nicely (ask me how I know).

Fuse 70 or 71, I can't recall. Easy work.

I've sliced my finger doing that as well

greg328 · 04-09-2015, 08:44 PM

Can anybody direct me to a step-by-step to install the Low pressure fuel sensor on a 2008 335i E92? Got the part, got the error code, just need to install it now.

Thanks,
Greg

JStang · 04-13-2015, 10:36 AM

Quote:

Originally Posted by greg328

Can anybody direct me to a step-by-step to install the Low pressure fuel sensor on a 2008 335i E92? Got the part, got the error code, just need to install it now.

Thanks,
Greg

See post 9 http://www.1addicts.com/forums/showthread.php?t=850742

j1gilles · 04-13-2015, 12:06 PM

Quote:

Originally Posted by JStang

Quote:

Originally Posted by Welterweight

Trickey install?

Not too bad. I saw one guy say he can do it in 20 minutes. I call BS on that. Definitely doable in an hour or so though.

Remove Intake
Remove Charge Pipe
Remove Throttle Body
Remove Junction Box
Pop off Connector (toughest part IMO)
Remove Old Sensor

No need to remove the intake manifold....

Levanime · 04-13-2015, 12:43 PM

whats the part number?

01-28-2015, 09:57 AM	#1
JStang Brigadier General 572 Rep 3,627 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	LPFP Reading 134 psi at idle About a week ago, I installed the Fuel It stage 2 pump and everything has been running very smoothly. About 10 minutes into my commute to work this morning I looked down at my Cobb AP and noticed that the LPFP was at 134 psi at idle . I hadn't taken the car past 3k RPM's. I looked at the codes and the always present 2AAF was there (no big deal) and I also had code 2A2D present. 2A2D - fuel low pressure system, fuel pressure What could be causing this? My initial thought is my LPFP sensor is on the way out. I replaced it about 2 years ago but I'm definitely not ruling it out. I remember that when the sensor was done I got code 29F3 and pressure would read 145.01 at all times. I already contacted Steve to get his thoughts but wanted to see if you guys had any experience or input.
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01-28-2015, 10:54 AM	#2
135Pats Major General 461 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	Could be the sensor, when it goes things get cray. My car has always pegged LPFP PSI a bit high, had a ridiculous saga with it last spring that Steve was able to tackle. Does it spike there? Or it is just pegging that. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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01-28-2015, 11:24 AM	#5
Tiago@VRSF 2108 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Sounds like the sensor is failing.
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01-28-2015, 12:28 PM	#7
JStang Brigadier General 572 Rep 3,627 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	Got in the car to go to lunch and LPFP is pegged at 145 and code 29F3 is now showing up. Looks like it's time to replace the sensor again after 2 years. could be worse! the other codes are gone.
	Appreciate 0 Quote

01-28-2015, 06:21 PM	#8
C.Pop First Lieutenant 65 Rep 385 Posts Drives: 335i Join Date: May 2013 Location: AZ iTrader: (0)	Generally when LPFP reads something high as a flatline, that means your sensor is junk. It's a pretty easy fix. __________________ 2007 E90, 6MT, VRSF 7" FMIC, RR DP's, Vargas Stage 2+ (19t unclipped), CP-e Charge Pipe/Tial BOV, BMS DCI, Fuel-it! Stg 2 LPFP, E66, 118k+ miles Brentuned Last edited by C.Pop; 01-28-2015 at 06:30 PM..
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01-28-2015, 08:04 PM	#11
Welterweight Major 100 Rep 1,337 Posts Drives: Truck in snow, coupe in summer Join Date: Jan 2013 Location: Boston iTrader: (3) Garage List 2012 BMW 328i [0.00] 2005 Dodge Ram Quad ... [0.00] 2009 BMW 335xi E92 [10.00]	My psi reads zero on occasion and code came up saying fuel sensor electric. Pretty straight forward right guys? Time for a new sensor.
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01-29-2015, 08:29 AM	#12
JStang Brigadier General 572 Rep 3,627 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	I put in the new sensor last night and problem solved.
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01-29-2015, 09:01 AM	#13
Welterweight Major 100 Rep 1,337 Posts Drives: Truck in snow, coupe in summer Join Date: Jan 2013 Location: Boston iTrader: (3) Garage List 2012 BMW 328i [0.00] 2005 Dodge Ram Quad ... [0.00] 2009 BMW 335xi E92 [10.00]	Trickey install?
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01-29-2015, 10:25 AM	#15
KeepRidingDirty Professional Monkey Trainer 65 Rep 423 Posts Drives: 2007 BMW 335xi Join Date: Aug 2014 Location: Ottawa, On iTrader: (1)	Took me about an hour. Easy just stuff to remove.
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04-09-2015, 08:44 PM	#19
greg328 Private First Class 12 Rep 109 Posts Drives: 2011 X5 MSport Join Date: Sep 2010 Location: Austin, TX, USA iTrader: (0)	?? Can anybody direct me to a step-by-step to install the Low pressure fuel sensor on a 2008 335i E92? Got the part, got the error code, just need to install it now. Thanks, Greg
	Appreciate 0 Quote

04-13-2015, 12:43 PM	#22
Levanime BimECU 193 Rep 760 Posts Drives: BMW Join Date: Dec 2014 Location: SD iTrader: (0) Garage List 2007 BMW 335 [0.00]	whats the part number?
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