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Old 01-28-2014, 03:21 PM   #1
spike9075
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2003 bmw 330ci e46

Hey everybody i am trying to figure out the issue on my 330ci and could really use some feed back, the issue is the car turns over but wont start. ripped out the back seat last night when turning the key to an on position the fuel pump did not hum at all. i then disconetted the fuel pump and used my multi meter to see what kind of power it was getting. I was only getting 3.9-4.1 Amps rather then the suggested 12-13 amps i should be getting. i am stumped and dont beleive spending the money on a new fuel pump will do anything.

I plugged in a code reader and the only thing that came up was something about a catalyst. (exhaust, nothing i can see being an issue with this and starting the car.

Any Help would be appreciate!!!

Thanks- a desperate BMW owner whos car wont start
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Old 01-28-2014, 04:22 PM   #2
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The engine needs to be cranked when checking voltage at the fuel pump.
It's rarely a power issue to the pump (on these cars).
Read my No start thread for ideas!
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Old 01-28-2014, 04:39 PM   #3
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By cranked do you mean have the key to on position or actually attempting to start it? I will have a read onyour thread! Thanks


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Old 01-28-2014, 08:27 PM   #4
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These cars are known to have fuel pump failures so that is a good place to start. Unless the pump was just replaced recently I would just change it out before doing anything else and I think you will find that is your issue.


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Old 01-28-2014, 08:45 PM   #5
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You are reading Volts, not Amps.

A reading of 3.9-4.1 Volts at the fuel pump is NORMAL when the key is on, but the engine is not cranking.

The fuel pump has a prime mode that lasts for a few seconds when the key is first turned on, then the pump will not run until the engine is cranking and this assumes the crank sensor is functional as well.

Fuel pumps are NOTORIOUS for dieing in the cold weather, ask me how I know.

I had to replace 2 in a very cold below freezing Jan a few years ago outside!

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

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Old 01-28-2014, 08:58 PM   #6
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Awesome thanks for all the suggestions guys! Getting the fuel pump out now, was very cold when it went -35celcius planning on picking a used on up for real cheap from the scrap yard just to insure that is the problem before spending 217$ got the clamp and hose off and seen on video to take a screw driver and hammer to losen it, mine is slightly rusted and doesnt seem like an area that should be heated to help the rust :p any suggestions?!


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Old 01-29-2014, 05:58 PM   #7
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Just tried putting a fuel pump in, still not getting any power to the pump no humm not noise no nothing! Also replaced the relay and still nothing! Any auggestions?!


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Old 01-29-2014, 06:53 PM   #8
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The problem could be in the wiring somewhere. I'm guessing you checked the fuse?
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Old 01-29-2014, 07:02 PM   #9
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Check the readings of the used pump you got before you take it back also. There is the possibility that the pump from the junkyard is shot also. I know it seams like a long shot but I've seen it happen before.


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Old 01-29-2014, 07:17 PM   #10
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That is almost what i am thinking! Got a buddy with a used pump that he knows works! Thats the next stepp i guesss! Hope it works! And yes mango checked fuse 54 still good not burnt!


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Old 01-29-2014, 07:21 PM   #11
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Check your fuel pressure, this could help you determine if you have a pump or fuel filter issue. If fuel pressure is good, and you get a crank-no-start, you could have a bad crank sensor.

What were the conditions of the no start? Did you have any symptoms leading up to the no start? Anything replaced or modified recently?

Edit: Definitely check out lszlszx's No start thread. Good info in there.

Last edited by JoeRoundel; 01-29-2014 at 07:25 PM. Reason: Additional info
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Old 01-29-2014, 07:26 PM   #12
spike9075
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That is almost what i am thinking! Got a buddy with a used pump that he knows works! Thats the next stepp i guesss! Hope it works! And yes mango checked fuse 54 still good not burnt!


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Old 01-29-2014, 07:28 PM   #13
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The car will crank but not start the morning it died it started but had a bit of problems! Nothing do to with gas replaced recently at all has been very cold here recently.

How do i check my crank sensor? Really appreciate all of the help guys!


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Old 01-30-2014, 11:39 PM   #14
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Happy to say the problem is fixed and didnt have to spend a penny! I pulled out the fuel pump and hit the actual pump part of it very softly with a hammer 4-5 times then turned the key and the pump started to prime again!(half power) so i hit it softly on the metal of the pump another few times and b bam was working like new again.

After being mind boggled as to how hitting this this a few time could fix it i did a little research to figure out why and it seems that the reason why alot of BMW s have issues with broken pumps is because that expensive high grade gas most of us probably put in our cars have no oil on it to keep the pumps lubricated and cause them to seize so often. Call me gullable or dumb for beleiving this one but hey i just saved myself 400 bucks from not buying a new pump and just pulling out the hammer for a few gentle taps!

jpgolf1 you were totaly right the one from the junk yard had seized as well! With a few light taps of a hammer got that one working as well! Looks like i got myself a 5 dollar backup!

Thanks for every ones help and advice happy to say ill be driving my baby to work tomorow!


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Old 01-30-2014, 11:58 PM   #15
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Nice, but keep in mind you might still need to replace the pump. The "bump" test is what we typically do in the field to diagnose a failing pump. Car shows up on a hook and you pound on the pump while cranking to get the car to start. Keep the tank full as the gasoline is what cools and lubes the pump.
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Old 01-31-2014, 12:01 AM   #16
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Perfect man thanks for the tip! Was told to fill up the tank full and put a liter of transmission fluid in the tank as well and it could revive it some more. Ever heard of such a thing?

Appreciate all the feedback as a newbie to the site!


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Old 01-31-2014, 12:07 AM   #17
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Quote:
Originally Posted by spike9075 View Post
I was only getting 3.9-4.1 Amps rather then the suggested 12-13 amps i should be getting.
I don't know whether you're using the multimeter wrong or reading it wrong. Volts is the reading you want - not amps. Put the meter on volts and go do it again.
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Old 01-31-2014, 04:51 AM   #18
mjpgolf1
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Quote:
Originally Posted by spike9075 View Post
Happy to say the problem is fixed and didnt have to spend a penny! I pulled out the fuel pump and hit the actual pump part of it very softly with a hammer 4-5 times then turned the key and the pump started to prime again!(half power) so i hit it softly on the metal of the pump another few times and b bam was working like new again.

After being mind boggled as to how hitting this this a few time could fix it i did a little research to figure out why and it seems that the reason why alot of BMW s have issues with broken pumps is because that expensive high grade gas most of us probably put in our cars have no oil on it to keep the pumps lubricated and cause them to seize so often. Call me gullable or dumb for beleiving this one but hey i just saved myself 400 bucks from not buying a new pump and just pulling out the hammer for a few gentle taps!

jpgolf1 you were totaly right the one from the junk yard had seized as well! With a few light taps of a hammer got that one working as well! Looks like i got myself a 5 dollar backup!

Thanks for every ones help and advice happy to say ill be driving my baby to work tomorow!


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Glad to help but as said above you still need a fuel pump. Your pump is giving out and will fully fail soon so be prepared. You are basically being warned by your car, which is rare, so take advantage of it and get a new pump installed before you have to add a tow bill on top of the price of the pump.


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Old 01-31-2014, 09:53 PM   #19
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Originally Posted by spike9075 View Post
Perfect man thanks for the tip! Was told to fill up the tank full and put a liter of transmission fluid in the tank as well and it could revive it some more. Ever heard of such a thing?

Appreciate all the feedback as a newbie to the site!


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I would not put transmission fluid in the fuel.
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