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Old 10-01-2017, 03:48 AM   #1
jmruvira
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Issues starting my M3

Hello y'all, I'm trying to seek a little help form this forums experienced mechanics hopefully. My E46 M3 was not started for a while and the tank was left totally empty. Today I put in it 5 gallons of fresh premium gas and I tried to start it but it wont start up. It turns over just fine but wont turn on. Does anyone have any idea what it could be or how to diagnose it?

Thank you all any and all help will be greatly appreciated. I've gone through hell with this car trying to get it back road worthy, from body shop lying about painting my car to mechanics skimming me. Since I'm not big on confrontations I just let people screw me over and move on, sorry for venting here but I just had to do it.
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Old 10-01-2017, 08:39 AM   #2
markusmarkus
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It takes a bit of time for fuel to get from the pump in the tank to the engine when the tank is empty. Are you sure the fuel pump is running? Check the fuse. Also, turn the ignition switch to the run position without goi g to the start position. Can you hear the fuel pump priming? Remove the back seat cushion to hear the fuel pump better.
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Old 10-01-2017, 07:07 PM   #3
doukas007
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Well, you should start from the basics which would be:
Battery
You said that car was sitting for some time due to work so maybe battery is out of juice. Jack it up on a professional charger and try again, or jump start the car (if you jump start it and the battery is actually empty, chances are that the next time you try to start it it will die egain, it takes a long trip to fully charge a battery from the car itself
Fuel pump
As suggested before, you should start by priming the pump by turning the key on accessories position waiting one or two seconds and then turning it all the way... Also, you may have a soft failing pump that is not circulating enough fuel when fuel level is low (if an e46 m3 pump is like a normal e46 in which this is quite common)
If these dont help , you should try to find a comprehensive gude post tha examines every possible no start cause :
http://forum.e46fanatics.com/showthread.php?t=1011677

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Last edited by doukas007; 10-01-2017 at 07:13 PM.
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Old 10-02-2017, 01:54 AM   #4
jmruvira
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Guys thx a million, I followed y'alls instructions and I found the culprit a fuel pump gone bad. When I removed the back seat and set my key to the accessories position and there was zero noise coming from the pump priming itself, I immediately suspected that. I checked the voltage and fine 12v. Then I removed it and WOW HOLY COW the sock filter was in pieces, the little hoses that get stuck when u try to remove the assembly were cracked in half, the rubber seal was like paste in your hand melting off, the float was also falling apart. I mean this was a nightmare never leave a car with a totally empty tank, I think is what did it in Miami's super hot ass climate.

So I guess my first project would be to clean the inside of the tank as best as I can, correct fellas? Then purchase a fuel pump and assembly, unless do you guys know if the fuel assembly parts can be purchased separately?
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Old 10-02-2017, 02:00 AM   #5
jmruvira
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THX doukas007 and markusmarkus, I posted an update..

Last edited by jmruvira; 10-02-2017 at 02:00 AM.
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Old 10-02-2017, 11:54 AM   #6
doukas007
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Buy an oem fuel pump, the whole assembly, I don't know if there are spares but it doesn't worth it anyway, as for the tank I guess you could try to clean it but I doubt it will be very effective cause you can't really get your hands everywhere

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Old 10-02-2017, 12:33 PM   #7
Jagdtiger
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You can buy just the pump but I would go ahead and replace the whole assembly. Get a vdo and you should be good.
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Old 10-02-2017, 07:21 PM   #8
jmruvira
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Yea that makes sense. I was just hopping I could change the couple of parts that were broken on it, as a new one will cost like $400. I could buy a used assembly but I still will need the pump so I would be around $500 and that's what I was trying to avoid, but hey its European nothing is cheap on them, lol...
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Old 10-02-2017, 08:08 PM   #9
jfoj
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The BMW Part Store show the pump assembly, 16142229684 @ $364.25

https://thebmwminipartstore.com/
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Lower hose temp switch O-ring - BMW #13621743299
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Old 10-03-2017, 08:59 AM   #10
markusmarkus
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Quote:
Originally Posted by jfoj View Post
The BMW Part Store show the pump assembly, 16142229684 @ $364.25



https://thebmwminipartstore.com/


And the bmwminipartstore is a dealer so you know you’re buying quality.


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Old 10-03-2017, 09:53 AM   #11
fordy_4
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Yes go OEM. Don't forget the sealing gasket too, and if it's your first time doing it then watch a few DIY videos on how the seat the gasket properly. I didn't and had fuel leaks in my 330 as a result. Lesson learnt.


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Old 10-03-2017, 11:41 AM   #12
jmo69
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Mount the seal to the tank and then the pump, followed by the ring.
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