I have a 2003 BMW 325CI, when i go to start it, it runs for like 5 seconds and then shuts off? would this be somthing to do with the fuel delivery? Runs smooth but just cuts out.

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325i

Fuse Box Diagram BMW 3-Series (E46; 1998-2006)

https://fuse-box.info > bmw > bmw-3-series-e46-1998-...
Here you will find fuse box diagrams of BMW 3-Series 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 and 2006 (316i, 318i, 318d, 320i, 320d, 323i, 325i, 328i, ..

Ci, Cabriolet

1998-2006 BMW 3 (E46) Fuse Box Diagram

https://www.e46fanatics.com > ... > E46 > E46 General
Oct 29, 2018 - Mine still has the card that identifies all the fuses but that is a good reference if yours is missing. 2002 BMW 325Ci Cabriolet Automatic, 140K ...

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Sounds to me like you have a wiring harness loose somewhere, or you have a short. Check to verify you have power at the fuse panel to the fuel pump and the instrument cluster (and, of coarse that all your fuses are good). It's also possible both problems are completely unrelated. Let us know what you find.

When you say that it tries to start but does not turn over - I interpret that to mean that the starter is cranking the engine, but the engine fails to start. Is that correct?
The ignition on these cars occasionally looses a single coil, but is not prone to loosing all ignition on all cylinders at once, so probability indicates that the problem is lack of fuel delivery.
This car is prone to two fuel delivery problems: 1) Failure of the fuel transfer pump that moves fuel from the driver side tank to the passenger side tank where the fuel delivery pump is located. If the car runs out of fuel when the gas gauge registers 1/4 full, and runs again if you add more fuel, this is the problem. 2) Failure of the fuel delivery pump. This is less common, but my wife's '04 330 lost a fuel pump at 80k miles, so it can happen.

fuel delivery problem. check fuel pressure, fuel filter.

100 k IS REALISTIC MILAGE IF YOU DON'T DRIVE HIGH MILAGE, I WOULD HAVE TO GET REAL DEAL TO BUY WITH 100K, CONTEMPLATE
REBUILDING ENGINE. IT'S ACTUALLY FRAME OF MIND

WHERE IS THE FUEL PUMP RELAY ON A 2004 BMW 325I?

most likely a tune up, dirty throttle body or one of the coil packs or the boot is bad.

Be more specific...is it a in tank fuel pump? it might not be under back seat...but rather BEHIND....go in the trunk and try to pull down the lining thats behind the back seat, if there.

Replace fuel filter and check fuel pump operation. Sounds like fuel starvation.

You really cannot mis it. It is at the front of the engine, top center. Black can-shaped housing. Unscrew the top of the housing and replace the paper element inside.