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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 > N54 no fuel pressure car won't start



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      02-13-2022, 11:40 PM   #1
Bs721
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N54 no fuel pressure car won't start

So I am at a complete loss here. I have searched all over trying to find a solution and have not found anything.

I have a 2007 335i that will not start. It cranks but won't start. I recently had the LPFP upgraded to the Radium dual 550 pump. Initially it drove fine from the shop to my house and then stalled. I started it and it stalled again. After calling the shop I ended up replacing the stock pump which acts as a lift pump.

After it kept dying and showing low pressure I primed the pumps and may have over primed them because fuel was dripping from my exhaust. Maybe it's flooded?? I checked all of the fuses and they are all good.

All in all this is what I have replaced so far and it still won't start

HPFP from FCP
Injectors from FCP
Radium LPFP
New Radium fuel lines
EOS Speed bmkp EKP
Low pressure sensor
New Battery
New plugs

When I try to start the car the low pressure reads at 3.5psi and the rail pressure reads at 60psi. And I am still showing a 29f2 code.

I have tried to start it after replacing the plugs but still it just cranks. Not sure what else I can check.
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      02-14-2022, 06:55 AM   #2
iqraceworks
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You should have 72psi from the LPFP....if you are only seeing 3.5psi, that's your problem. And if your issues started shortly after upgrading the LPFP.....I'd say that you have a 99.9% chance of having an issue with that pump.

Open the tank, pull out the pump, make sure there isn't a kinked hose and/or a cracked fitting or hose that's blown off.
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos.
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      02-14-2022, 09:57 PM   #3
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I pulled the lpfp and checked the hoses, made sure it powers up. Everything looks perfect.

I have tried to reach out to Radium but they still have not replied.
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      05-21-2022, 01:53 AM   #4
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Did you ever resolve this ?
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