Turn it off, come back in 10 minutes it starts then it shuts off?

2011 BMW 535I
92,000 MILES • 6 CYL • TURBO • 2WD • AUTOMATIC
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BHAMDOC1973
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Car starts fine with no misfiring or stumbling, leave it running and is fine. Turn it off, come back in 10 minutes it starts then shuts off. I pulled the codes first and there were few fuel related ones first, then deleted them and when i started it and she stumbled pulled only one code which is p15df. I'm trying to find out if this one has a low-pressure sensor or not, as some of them do not. And whether this pinpoints to a low pressure sensor under the hood or a low-pressure pump in the tank, getting some conflicting views based on my readings.
Aug 20, 2023 at 1:13 PM
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STRAILER
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It sounds like the engine coolant sensor #2 needs to be replaced, here is information on the code and the sensor location so you can change it out.

The P15DF code in a 2011 BMW 535i indicates a fault related to the "Engine Coolant Temperature Sensor 2."

Check out the images (below). Please let us know what you find.
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Aug 21, 2023 at 10:21 AM
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BHAMDOC1973
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That is weird, everywhere i looked it talks about a fuel sensor or a pump, ugh.
Aug 21, 2023 at 10:23 AM
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BHAMDOC1973
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I have the N54 engine.
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Aug 21, 2023 at 12:52 PM
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BHAMDOC1973
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Unless that end number of 54 is just for the evap.
Aug 21, 2023 at 3:28 PM
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STRAILER
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My bad, the code is for Faulty Rail-Pressure Sensor, here is the location so you can swap it out to fix the problem. Check out the images (below). Please let us know what happens.
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Aug 22, 2023 at 10:47 AM
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BHAMDOC1973
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Do you have a part number?
Aug 22, 2023 at 10:58 AM
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BHAMDOC1973
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Changed the rail sensor and the tank pump same thing. First picture is when the car is off ignition on. Second when started.
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Aug 30, 2023 at 7:57 AM
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BHAMDOC1973
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Codes
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Aug 30, 2023 at 7:58 AM
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BHAMDOC1973
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I see tthe fuel line goes under the intake, is there another sensor there? Also the hpfp is not on too like the 4 cylinders, can you tell me if its under the intake?
Aug 30, 2023 at 8:06 AM
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STRAILER
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From the codes it looks like the fuel pump is going out. Have you done a fuel pressure test?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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Aug 31, 2023 at 10:18 AM
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BHAMDOC1973
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Disconnected the hose to measure pressure but noticed nothing came out. Removed pump again turned out one of the wires inside is loose, connected it and all good, thanks.
Aug 31, 2023 at 11:40 AM
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STRAILER
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Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
Sep 1, 2023 at 8:56 AM