Too much E85 --> Fuel Pump shutdown?

inevitab1e · 09-21-2023, 02:08 PM

Twice in the past month I've had my engine shut down during partial throttle acceleration. Once in 5th gear, another in 2nd.
The HUD in the vehicle displays "Fuel Pump" as the malfunction.
Engine won't start. Have to disconnect battery for engine to start again and everything back to normal.
I have a stage 2 LPFP.
Would too much E85 in the tank cause the Fuel pump to shutdown completely?

N55 Code = 2BE9

wheela · 09-21-2023, 07:03 PM

I wonder if the current draw from your stage 2 lpfp is over heating your ekp and triggering the fault? I haven't dug into ekp's too much, but I know bigger lpfp can over-tax them and cause issues.

09-21-2023, 02:08 PM	#1
inevitab1e Second Lieutenant 49 Rep 220 Posts Drives: '13 135i N55 FBO Join Date: Feb 2017 Location: there iTrader: (0)	Too much E85 --> Fuel Pump shutdown? Twice in the past month I've had my engine shut down during partial throttle acceleration. Once in 5th gear, another in 2nd. The HUD in the vehicle displays "Fuel Pump" as the malfunction. Engine won't start. Have to disconnect battery for engine to start again and everything back to normal. I have a stage 2 LPFP. Would too much E85 in the tank cause the Fuel pump to shutdown completely? N55 Code = 2BE9 Last edited by inevitab1e; 09-21-2023 at 02:22 PM..
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09-21-2023, 07:03 PM	#2
wheela Captain 280 Rep 696 Posts Drives: 2015 BMW X1 35i M-sport Join Date: Mar 2021 Location: Twin Cities MN iTrader: (0)	I wonder if the current draw from your stage 2 lpfp is over heating your ekp and triggering the fault? I haven't dug into ekp's too much, but I know bigger lpfp can over-tax them and cause issues.
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