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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 11-04-2010, 08:02 AM   #1
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Join Date: Sep 2003
Location: NW FL
Posts: 138
My Ride: '01 330CI / '11 335i
Suggestions on car not starting, after sitting overnight

2001 330CI
Car drove fine yesterday, had about 1.5 gallons in the tank and filled up at normal gas station with 93 octane.
Car is turning over but won't start. Also hooked up a charger/starter and switched it to starter mode and won't not start.
Fuel filter replaced less than 15,000 miles ago
New spark plugs in the last year.
O2 sensors changed in the last 80k miles
There are no error codes on the system.

I've had 2 similar problems in the past due to incorrect fuel gauge reading, but I have a full tank this time so that's not the issue.
The other time while the engine would crank just fine it ended up being the battery and a new one fixed the issue.

Any suggestions?

My thoughts are fuel pump, possible dirty fuel filter, maybe ignition coils?


Last edited by nughaud; 11-04-2010 at 08:21 AM.
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Old 11-04-2010, 01:26 PM   #2
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Join Date: Sep 2003
Location: NW FL
Posts: 138
My Ride: '01 330CI / '11 335i
Well I was able to borrow a friend's vehicle so hopefully I'll figure it out myself or get it fixed.
I'm going to buy a new battery as it's been probably 4 years give or take anyway.
I'll check the fuses for the fuel pump, and check my plugs for corrosion, white, black or if they are wet.
I'd be delighted if it is a fuse or possibly clogged fuel filter. Just find it odd it stopped overnight with no issues before.
It wasn't cold either, probably low 50s overnight.
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Old 12-03-2010, 07:27 PM   #3
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Join Date: Sep 2003
Location: NW FL
Posts: 138
My Ride: '01 330CI / '11 335i
It ended up being the fuel pump. I ended up changing it out with a full tank of gas which is supposedly safer due to less fumes, but harder to work with since you will get gas on things to include your hands, so wear gloves. I disconnected the battery and had a fan blowing from inside my house out through the garage to disperse any fumes.
There is a good set of videos on Youtube that involves a replacement fuel pump and housing but it shows the steps for replacing the new pump and housing. The hardest part is getting off the locking cap/ring, removing and put the pump back in and then putting back on the locking cap/ring back on.

I knew for sure it was an issue when I turned the key and could hear the pump priming. I did this a few times to get gas back in the lines, about 4-5 and then the car started right up.

Just thought I'd update my issue in case anyone else had the same problem.

Here are the 3 part videos I used to due the fuel pump change out
This gives you a general idea of how to remove the fuel pump and then replace it. Even though it's for a M3, it's the same basic process.


Last edited by nughaud; 12-03-2010 at 07:32 PM.
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Old 12-07-2010, 10:19 AM   #4
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Join Date: Feb 2008
Location: Houston
Posts: 951
My Ride: 2001 325Xi
Did you do like they did in the video and just do the pump or the complete assembly. I plan on just doing the pump like them
Originally Posted by jbeurotech View Post
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