Walbro 450 lpfp help

kadA · 11-16-2021, 09:49 AM

hello everyone. i have a 135i n54 that just crossed the 150k mark. i have owned this car for about 20k miles and bought the car with all the power modes already installed. the car has had a Walbro 450 in it for about 65-70k miles. over the past 4 weeks i have been having a problem. It started when i was sitting in a parking lot before school and i had a fuel pump malfunction code come up on my screen. i had to go to in so i didnt pull codes tell about 5 hours later and there was nothing. i checked the codes a few day later and had a fuel pump plausibility. about 2 weeks later i was sitting at the store and the car just shut off. i tried to turn it back on and it stuttered then died. I look in the engine bay for a boost leak and saw nothing so i tired to start it again and all ways well. i didnt think much of it then it did it twice more and the 3rd time i was outside the car and had a friend start it after letting it sit for 5ish minutes and fuel spit out the back. i made the choice and was going to take it to a local shop because i was stumped on what it was because the code could be so many things. On the way to school the next morning it died on the highway while in traffic and did not start up again. got it towed home and did some more digging and landed on it being that the lpfp went out. i ordered another Walbro 450 because im lazy and did not want to get it re tuned. apologize for the very long run up to my real question but since it had the same fuel pump in it i should be able to just drop it in and all should be well right?

1and1 · 11-16-2021, 01:53 PM

Yep, it's a 1:1 replacement for a part that, at this point in time, has already been addressed in your tune. It's a non-native part, so does not need to be "coded" to the car like, say, any of a dozen other replacement BMW parts would.

Have you logged anything to correlate with your parts replacement? Sounds right, but logs would verify the low values from your LPFP

iminhell1 · 11-16-2021, 03:41 PM

Should be 1:1 unless it's a Fuel-It kit. That dipshit Dave cuts the nipple off and threads it.
If that's what you run into then this is the pump fitting you'll want --> https://precisionraceworks.com/produ...r-walbro-pumps

ferocity02 · 11-16-2021, 11:45 PM

Does it run now after getting it towed home?

If it does, Its more likely that the EKP module is giving out. The Walbro pump pulls more current and puts more stress on the module. In turn it gets very hot and overheats and then turns itself off until it cools, thus turning off the pump. It's apparent that this is the issue if it dies but will restart some time later (10 mins) and runs fine until it overheats again.

You can pull the back seat and rear passenger bolster and see how hot that sucker gets. You can also pull the black cover off the module and use a fan to keep it cool while driving to see that it doesn't die.

Pretty common issue. Mine does the same thing so I added a cooling fan which many people have done. Sounds like you need to replace the module anyways, and then probably add some cooling for good measure. EKPM3 is a common upgrade if you have an EKPM2.

11-16-2021, 09:49 AM	#1
kadA Registered 0 Rep 4 Posts Drives: 2008 335xi e92 Join Date: Apr 2021 Location: colorado iTrader: (0)	Walbro 450 lpfp help hello everyone. i have a 135i n54 that just crossed the 150k mark. i have owned this car for about 20k miles and bought the car with all the power modes already installed. the car has had a Walbro 450 in it for about 65-70k miles. over the past 4 weeks i have been having a problem. It started when i was sitting in a parking lot before school and i had a fuel pump malfunction code come up on my screen. i had to go to in so i didnt pull codes tell about 5 hours later and there was nothing. i checked the codes a few day later and had a fuel pump plausibility. about 2 weeks later i was sitting at the store and the car just shut off. i tried to turn it back on and it stuttered then died. I look in the engine bay for a boost leak and saw nothing so i tired to start it again and all ways well. i didnt think much of it then it did it twice more and the 3rd time i was outside the car and had a friend start it after letting it sit for 5ish minutes and fuel spit out the back. i made the choice and was going to take it to a local shop because i was stumped on what it was because the code could be so many things. On the way to school the next morning it died on the highway while in traffic and did not start up again. got it towed home and did some more digging and landed on it being that the lpfp went out. i ordered another Walbro 450 because im lazy and did not want to get it re tuned. apologize for the very long run up to my real question but since it had the same fuel pump in it i should be able to just drop it in and all should be well right?
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11-16-2021, 01:53 PM	#2
1and1 Loves me some MHD! 1857 Rep 1,719 Posts Drives: faster than he should... Join Date: Jul 2016 Location: Tally, FL iTrader: (2) Garage List '09 135i [10.00]	Yep, it's a 1:1 replacement for a part that, at this point in time, has already been addressed in your tune. It's a non-native part, so does not need to be "coded" to the car like, say, any of a dozen other replacement BMW parts would. Have you logged anything to correlate with your parts replacement? Sounds right, but logs would verify the low values from your LPFP __________________ 1and1 135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla . . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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11-16-2021, 03:41 PM	#3
iminhell1 C2H5OH 3915 Rep 2,144 Posts Drives: 2010 SG 135i auto Join Date: May 2015 Location: Darwin, MN iTrader: (1)	Should be 1:1 unless it's a Fuel-It kit. That dipshit Dave cuts the nipple off and threads it. If that's what you run into then this is the pump fitting you'll want --> https://precisionraceworks.com/produ...r-walbro-pumps
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11-16-2021, 11:45 PM	#4
ferocity02 Colonel 530 Rep 2,083 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	Does it run now after getting it towed home? If it does, Its more likely that the EKP module is giving out. The Walbro pump pulls more current and puts more stress on the module. In turn it gets very hot and overheats and then turns itself off until it cools, thus turning off the pump. It's apparent that this is the issue if it dies but will restart some time later (10 mins) and runs fine until it overheats again. You can pull the back seat and rear passenger bolster and see how hot that sucker gets. You can also pull the black cover off the module and use a fan to keep it cool while driving to see that it doesn't die. Pretty common issue. Mine does the same thing so I added a cooling fan which many people have done. Sounds like you need to replace the module anyways, and then probably add some cooling for good measure. EKPM3 is a common upgrade if you have an EKPM2.
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