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Ocean Ocean is offline
Posts: 1,419
Join Date: May 2011
Car: 2008 535i Sport
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Default 06-11-2019, 09:13 AM

This sounds like it is the EKP fuel module. I experienced identical issues some years ago and wrote a lengthy post about it. I replaced it and set it on a small heat sink. No issue since.
Basically the Walbro has a higher amp draw which generates excessive heat. Causes the signal from the EKP to be compromised, ECU then shuts off both pumps and ignition. Once the EKP module cools off after 5-10 min car starts and drives again. Until heat builds up, repeat cycle.
Its located in trunk near gas filler. Peal side cloth aside and you see it mounted on inside. It has a metal plate for heat sink. Mount the new one on a heat sink with fins. I used a 4x4" aluminum heat sink. Have had zero issues since.

Sleeper 5 series
Performance: Pro tuned MHD, xHP Stage 3 TCU flash, DCI, AR kittens, ER FMIC & CP, Fuel-It Stage 2 LPFP w ported rail, RB turbos, RB inlets, KW V2, Mfactory LSD
Audio: Jehnert Flatline speakers, Mobridge M1000 DA2 digital preamp, Helix P-DSP, Zapco Z-150.6 amp, CIC iDrive upgrade
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