BMW 3 Hybrid Stalling: Fuel Pump or Something Else?

Hey there! I had nearly identical issues with my 2019 BMW 5 Series Hybrid at 65k km. Initially thought it was the fuel pump too, but turned out to be a faulty wiring harness connector to the fuel injection system. The symptoms were exactly like yours, rough idle, stalling, hard starts, and terrible fuel economy. Found this out when I took it to the dealership service center. The diagnostic showed multiple misfires. The main culprit was a corroded connector that wasn't properly sealed, causing intermittent electrical connection issues. While not a major repair in terms of parts, it definitely needed immediate attention as it could've damaged other components if left unchecked. The wiring harness repair solved all the issues, smooth running ever since. Given your symptoms, I'd strongly suggest getting the electrical connections and wiring checked first before assuming it's the fuel pump. A proper diagnostic scan should pinpoint the exact issue. Best of luck with the fix.

Hey, thanks for sharing that! Really helpful info about the wiring harness. Just wondering, do you remember roughly how much you ended up paying for the repair? Also, has everything been running smoothly since then, or have you noticed any other quirks pop up? I'm trying to get an idea of what I might be looking at cost-wise and if I should prepare for any follow-up issues.

Hey again! Yep, got my BMW 5 Series Hybrid back in top shape! After having it checked out by the mechanic, it actually turned out to be exactly what I originally suspected, a defective fuel pump. The fix was pretty straightforward and only cost me 95 € to repair a faulty cable connection to the pump. Way less painful on the wallet than I expected! Since getting it sorted, the car's been running like a dream, no more stalling, rough idling, or any of those annoying start-up issues. Fuel economy is back to normal too. Haven't had a single problem since the repair, which was honestly a huge relief. It's funny how these things work out, in my first reply I thought it was the wiring harness causing trouble, but sometimes the obvious answer is the right one! If your symptoms are still matching what I experienced, you might be looking at a similar simple fix. Just make sure you get a proper diagnosis to be certain. Best of luck with your ride! Let us know how it turns out.

Thanks for the follow-up! Just wanted to update you all, took my car to a new mechanic yesterday and got it sorted. You were right about getting a proper diagnosis first. Turned out to be a combination of issues, mainly a clogged fuel filter and some dirty injectors. Cost me around €300 for the complete service, including cleaning and parts. The mechanic was great, actually showed me the gunk that was causing all the trouble. Way better experience than my last repair shop visit! Car's running smoothly now, starting up perfectly, and my fuel consumption is back to normal. Such a relief to have it fixed properly. Really appreciate everyone's input here. Amazing how what seems like a major issue can often be fixed without breaking the bank. Definitely learned my lesson about regular maintenance checks and finding a trustworthy mechanic. Thanks again for all the advice!