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mmarine9 mmarine9 is offline
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Join Date: Sep 2018
Car: 2008 335i
Default Fuel gauge reading empty after lpfp upgrade - 09-07-2021, 07:45 PM

installed a new walboro lpfp with a new bucket assembly. after replacement the car reads empty even with gas and I also have the following codes:
29F3 DME: Fuel low-pressure sensor, electric
2DE4 DME: Fuel level sensor, left: Signal
2DE5 DME: Fuel level sensor, right: Signal
2DED DME: Power management, closed-circuit current violation.

no check engine light and the car runs fine and pulls strong. lpfp readings in jb4 never drop below 50.
hooked up the old lpfp outside of the tank and even when moving the float by hand it still reads empty and does not move.
i checked all 3 fuses in the glove back that were under the gas pump picture on the diagram. all are fine not burnt out.

any ideas?
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NoGuru NoGuru is offline
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Posts: 39
Join Date: Apr 2017
Car: 2011 335is
Default 09-08-2021, 07:25 AM

Float is stuck or the connection to the float is not connected.
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mmarine9 mmarine9 is offline
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Car: 2008 335i
Default 09-08-2021, 07:52 AM

so the float is for sure not stuck we verified over and over and it is connected. I also dont think that this would cause BOTH left and right to be throwing codes as we only replaced the passenger side right one. Also as i said we hooked the old oem pump (that had just worked) back up OUTSIDE of the tank and moved the float by hand and still no result on the gauge.
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