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Bullyking Bullyking is offline
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Default Fuel cut at 5k - 09-08-2021, 01:18 PM

I had codes for hpfp pressure too low so I replaced the pump and it’s doing the same thing wondering it it’s a lpfp issue not running JB4 anymore due to a broken corroded pin in harness JB4 is completely unplugged so running stg 2+ MHD has been good for the last couple months until 2 weeks ago


2013 535i n55 c/dp, bms intake , Jb4, MHD pwg2 e85 bef ngk 2step cooler plugs walbro 450 lpfp e40
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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Default 09-09-2021, 10:16 AM

Unfortunately we don't look at MHD logs but the HPFP on those is pretty weak so you are likely exceeding it's capacity if your LPFP is healthy/upgraded. If that's the case, it'll get worse as the weather cools down.



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Bullyking Bullyking is offline
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Default 09-09-2021, 01:00 PM

I just replaced the hpfp that log was after replacing it also waiting for my walbro 450 F90000274 to come in tomorrow to install in my lpfp bucket hopefully it works out


2013 535i n55 c/dp, bms intake , Jb4, MHD pwg2 e85 bef ngk 2step cooler plugs walbro 450 lpfp e40
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Bullyking Bullyking is offline
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Default 09-09-2021, 01:02 PM

Do I need to have a upgraded hpfp to run full e85? Or just lpfp ?


2013 535i n55 c/dp, bms intake , Jb4, MHD pwg2 e85 bef ngk 2step cooler plugs walbro 450 lpfp e40
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Bullyking Bullyking is offline
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Default 09-10-2021, 05:00 PM

Got it figured out. Turns out the line that comes off of the low pressure pump had a hole in it that explains why I had a tank ventilation problem a while back. Installing a new hose and a walbro 450 pump hoping I’ll get more power now


2013 535i n55 c/dp, bms intake , Jb4, MHD pwg2 e85 bef ngk 2step cooler plugs walbro 450 lpfp e40
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