F30 328i Low Fuel Rail Pressure

Mr.328i · 03-03-2025, 04:26 PM

2012 328i, N20 engine. When cold, car starts up completely fine, i can drive off no issues. However after about 20-30 minutes of normal traffic driving car loses fuel rail pressure and throws a low fuel rail pressure warning and drivetrain error. main code - P0087. The pressure drops to 1200kPa on idle and rises to around 1500kPa under acceleration. Keep in mind that when the car is fine its FINE i can pull to redline and has no issues maintaining the 7000kPa when idle and 20000kPa under acceleration. This tells me the hpfp cannot have failed as its a purely mechanical component and wouldnt work at all if it had gone bad. If i turn the car off and restart after a while the issue goes away and i can drive iff as normal. I have put a heatsink on the EKPM mosfet and a blower fan on the module so it cant be overheating, and the lpfp had been replaced last year due to a leak in the orignal(not genuine bmw pump). I think it’s the fuel rail pressure sensor. Any help would be greatly appreciated! Thanks

Shirazkhan · 03-03-2025, 04:36 PM

Get a fuel pressure gauge and check the pressure from the lpfp.

Three20i · 08-18-2025, 10:15 PM

Quote:

Originally Posted by Mr.328i

2012 328i, N20 engine. When cold, car starts up completely fine, i can drive off no issues. However after about 20-30 minutes of normal traffic driving car loses fuel rail pressure and throws a low fuel rail pressure warning and drivetrain error. main code - P0087. The pressure drops to 1200kPa on idle and rises to around 1500kPa under acceleration. Keep in mind that when the car is fine its FINE i can pull to redline and has no issues maintaining the 7000kPa when idle and 20000kPa under acceleration. This tells me the hpfp cannot have failed as its a purely mechanical component and wouldnt work at all if it had gone bad. If i turn the car off and restart after a while the issue goes away and i can drive iff as normal. I have put a heatsink on the EKPM mosfet and a blower fan on the module so it cant be overheating, and the lpfp had been replaced last year due to a leak in the orignal(not genuine bmw pump). I think it’s the fuel rail pressure sensor. Any help would be greatly appreciated! Thanks

Did you determine that this was the fuel rail pressure sensor?

03-03-2025, 04:26 PM	#1
Mr.328i Registered 0 Rep 1 Posts Drives: BMW 328i F30 Join Date: Mar 2025 Location: Mumbai iTrader: (0)	F30 328i Low Fuel Rail Pressure 2012 328i, N20 engine. When cold, car starts up completely fine, i can drive off no issues. However after about 20-30 minutes of normal traffic driving car loses fuel rail pressure and throws a low fuel rail pressure warning and drivetrain error. main code - P0087. The pressure drops to 1200kPa on idle and rises to around 1500kPa under acceleration. Keep in mind that when the car is fine its FINE i can pull to redline and has no issues maintaining the 7000kPa when idle and 20000kPa under acceleration. This tells me the hpfp cannot have failed as its a purely mechanical component and wouldnt work at all if it had gone bad. If i turn the car off and restart after a while the issue goes away and i can drive iff as normal. I have put a heatsink on the EKPM mosfet and a blower fan on the module so it cant be overheating, and the lpfp had been replaced last year due to a leak in the orignal(not genuine bmw pump). I think it’s the fuel rail pressure sensor. Any help would be greatly appreciated! Thanks
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03-03-2025, 04:36 PM	#2
Shirazkhan Second Lieutenant 76 Rep 297 Posts Drives: F22,GO1,i20,POLO,BANTAM,BREZZA Join Date: Jan 2021 Location: South africa iTrader: (0)	Get a fuel pressure gauge and check the pressure from the lpfp.
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