LPFP Issue with Walbro 450

lukechristy · 05-06-2021, 02:14 PM

Quote:

Originally Posted by NoGuru

I drag race with a basketless and have had zero issues. This can be debated forever.

Where did you source the pump from? Amazon has lots of counterfeit Walbros.

Got the pump from Racetronix. I will probably contact them after I test the EKP if I cannot find the issue.

lukechristy · 05-06-2021, 03:49 PM

Quote:

Originally Posted by stewbets

Don't worry about all the bucketless naysayers. It's a proven mod. Bucketless is not your problem. Definitely get a log as soon as possible and upload it to datazap.me. That should be your automatic go-to with these sorts of issues. And I don't know anything about Racetronix, but I do know there are lots of Walbro fakes out there.

https://datazap.me/u/lukechristy/log...a=2-3-13-22-23

These are the logs I just went out and got. Please let me know if you see anything. Thanks again

I will go pull the pump out right now and take pictures.

stewbets · 05-06-2021, 04:06 PM

Quote:

Originally Posted by lukechristy

https://datazap.me/u/lukechristy/log...a=2-3-13-22-23

These are the logs I just went out and got. Please let me know if you see anything. Thanks again

I will go pull the pump out right now and take pictures.

You weren't kidding. That fuel pressure is tanking on minimum load! If you don't have a kinked or damaged hose and the bucket is cut open like I'm assuming it is, I feel like it has to be a defective pump. If there are no hose issues, I'd probe the power wires with a multimeter to see what voltage the pump is seeing while driving.

iqraceworks · 05-06-2021, 04:23 PM

Quote:

Originally Posted by lukechristy

https://datazap.me/u/lukechristy/log...a=2-3-13-22-23

These are the logs I just went out and got. Please let me know if you see anything. Thanks again

I will go pull the pump out right now and take pictures.

Something is definitely wrong with the LPFP or the plbing job you did on the pump...the pressure is dropping like a rock before you even get into any boost. I don't think it has anything to do with the EKP.

If it was me I would pull the pump back out and make sure no hoses or fittings blew off.

lukechristy · 05-06-2021, 04:31 PM

Quote:

Originally Posted by stewbets

You weren't kidding. That fuel pressure is tanking on minimum load! If you don't have a kinked or damaged hose and the bucket is cut open like I'm assuming it is, I feel like it has to be a defective pump. If there are no hose issues, I'd probe the power wires with a multimeter to see what voltage the pump is seeing while driving.

How am I supposed to measure the voltage while driving? Open fuel cell? I've already pulled the pump and checked all of the lines. They look fine, unless there is a break in a fuel line going towards the engine, but the car starts on the first crank so I'm assuming there is fuel in the lines before I start it.

iqraceworks · 05-06-2021, 04:41 PM

Tap into the power wires running from the EKP to the pump.....run the wires to a voltmeter so that you can see it when driving. Watch the voltage....see if it drops down the same time your pressure starts to dive off.

NoGuru · 05-07-2021, 08:26 AM

I missed the Racetronix part. I don't see them on the Authorized dealer list but I could be looking in the wrong place. I would still ask them.

The filter goes on really tight and I would be very surprised if it is that. I would be looking for a cracked hose or loose connection.

feuer · 05-07-2021, 06:06 PM

I'm thinking issue with the fuel regulator. Is the fuel gauge moving too?

C.Pop · 05-08-2021, 08:32 PM

Post a pic of your setup. Sounds like you popped a line.

lukechristy · 05-10-2021, 06:36 PM

Quote:

Originally Posted by feuer

I'm thinking issue with the fuel regulator. Is the fuel gauge moving too?

Fuel gauge is working fine. Getting a code for it but it is reading the correct level of fuel.

feuer · 05-11-2021, 01:47 PM

Quote:

Originally Posted by lukechristy

Fuel gauge is working fine. Getting a code for it but it is reading the correct level of fuel.

When running low on fuel like 1/4 and WOT do you notice the fuel gauge fluctuating?

05-06-2021, 04:41 PM	#28
iqraceworks Brigadier General 2114 Rep 3,811 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Tap into the power wires running from the EKP to the pump.....run the wires to a voltmeter so that you can see it when driving. Watch the voltage....see if it drops down the same time your pressure starts to dive off.
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05-07-2021, 08:26 AM	#29
NoGuru Major 779 Rep 1,436 Posts Drives: 335is Join Date: Apr 2017 Location: MI iTrader: (0) Garage List 2021 Chevy Silverad ... [0.00] 2014 CTS [0.00] 2011 335is [0.00]	I missed the Racetronix part. I don't see them on the Authorized dealer list but I could be looking in the wrong place. I would still ask them. The filter goes on really tight and I would be very surprised if it is that. I would be looking for a cracked hose or loose connection. __________________ 2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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05-07-2021, 06:06 PM	#30
feuer Major General 4310 Rep 9,230 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	I'm thinking issue with the fuel regulator. Is the fuel gauge moving too?
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05-08-2021, 08:32 PM	#31
C.Pop First Lieutenant 65 Rep 385 Posts Drives: 335i Join Date: May 2013 Location: AZ iTrader: (0)	Post a pic of your setup. Sounds like you popped a line. __________________ 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
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