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General E46 Forum
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Old 03-21-2015, 07:40 PM   #1
jeepo23
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Strange symptom.. What could it be?

Hey all, last week I drove over to a buddies place about 1.5hours away on the way there everything was fine, as I am getting closer to his place there is this sharp turn as I come out of the turn the car starts to jerk/loose power and almost like surge/hesitate.. as I keep going I have to go uphill so as I am accelerating hard it starts to do the same thing. About half a tank of fuel at this point in the tank. I get to his place and car stays put for a couple of days as I am visiting.

The following Monday I leave and head back home, fuel up as I was driving through a storm and in case I get stuck or delays.. Car performs flawlessly with no issues.

Throughout the week going to work and home no issues, over half tank of fuel.

Friday I was heading out again as I am driving down the highway I start to notice the same jerking/ losing power / surging feeling to the car. And this point I was coming to a gas station so I pulled in and fuelled up. Full tank, drive my 100miles to destination - without a hiccup.

Now this is making me start to wondering what this could be? Both times I noticed this issue I was right about half a tank of fuel or slightly less. Could this be a fuel pump issue? No codes are thrown on the car. I was going to connect INPA up tomorrow and check if there is any sort of errors hidden.

Any idea what my problem could be with the symptoms I listed? Car is a 02, 330XI.
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Old 03-21-2015, 07:47 PM   #2
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Fuel pumps usually fail, or rather show signs of failing during the on/off stages. Although my fuel pump in my second e46 ran after starting but sputtered out and died. Does any lights on the dash come on when this happens? If not might be your pump
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Old 03-21-2015, 07:51 PM   #3
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Originally Posted by NumbaOneNewb View Post
Fuel pumps usually fail, or rather show signs of failing during the on/off stages. Although my fuel pump in my second e46 ran after starting but sputtered out and died. Does any lights on the dash come on when this happens? If not might be your pump
Yah no lights on the dash during this happening.

Just I felt my IDLE sort of dip and it almost felt like my tires were slipping and the car was just kind of losing power and not going anywheres.

I keep thinking its pump.. half a tank maybe its just getting weaker & weaker.. with a full tank it still has a chance to keep the pump cold enough to perform properly.. as soon as it gets lower it starts to do this crap?
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Old 03-21-2015, 10:06 PM   #4
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Sounds like the fuel pump, Replace the filter while you're at it.
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Old 03-21-2015, 10:15 PM   #5
jfoj
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Replace the fuel pump or you will soon be walking.

Read the 2nd link in my signature.

Fuel pumps rarely cause errors when they fail.
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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

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

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Old 03-22-2015, 10:51 AM   #6
jeepo23
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Originally Posted by jfoj View Post
Replace the fuel pump or you will soon be walking.

Read the 2nd link in my signature.

Fuel pumps rarely cause errors when they fail.
Alright thanks for the info. So what's the deal with what brand of fuel pump?
I see on eeuroparts they have one for 99$ and then one for $189..

So basically you guys do think that this issue I am seeing is probably fuel pump related?
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Old 03-22-2015, 03:16 PM   #7
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Assume you are in Canada, so not sure if www.bmaparts.com is a good option for you?

Suggest you buy the pump/sending unit combo unit, not worth trying to cobble a stand alone pump into the sending unit. If you have the pump/sender unit, you can swap in as little as 15 minutes. If you have a stand alone pump you may be stuck screwing around mounting the pump for 30-45 mins or more and risk damaging the actual sender.
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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

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-23-2015, 02:33 AM   #8
SilberVogel
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Quote:
Originally Posted by jeepo23 View Post
Alright thanks for the info. So what's the deal with what brand of fuel pump?
I see on eeuroparts they have one for 99$ and then one for $189..

So basically you guys do think that this issue I am seeing is probably fuel pump related?
Agree with what others have said, that it sounds like your fuel pump. The brand you want to go with is Siemens/VDO (OEM) and BMA Parts that jfoj linked to consistently has the best price on it at $125. Donít know the best options for shipping to Canada, but eEuroparts that you mentioned shows the Siemens/VDO pump (#16146766942) at $150, and both sites offer free shipping at that price point.

Easy DIY. Here's a good YouTube video, as well: https://www.youtube.com/watch?featur...VGpkan0rE#t=52.
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Old 03-23-2015, 06:56 AM   #9
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Originally Posted by jfoj View Post
Assume you are in Canada, so not sure if www.bmaparts.com is a good option for you?

Suggest you buy the pump/sending unit combo unit, not worth trying to cobble a stand alone pump into the sending unit. If you have the pump/sender unit, you can swap in as little as 15 minutes. If you have a stand alone pump you may be stuck screwing around mounting the pump for 30-45 mins or more and risk damaging the actual sender.
Yes I am in Canada.. The one I see on eeuroparts is a Nordic one..

If I see correctly that's the whole pump..
http://www.eeuroparts.com/Parts/5965...-16146766942A/

Quote:
Originally Posted by SilberVogel View Post
Agree with what others have said, that it sounds like your fuel pump. The brand you want to go with is Siemens/VDO (OEM) and BMA Parts that jfoj linked to consistently has the best price on it at $125. Don't know the best options for shipping to Canada, but eEuroparts that you mentioned shows the Siemens/VDO pump (#16146766942) at $150, and both sites offer free shipping at that price point.

Easy DIY. Here's a good YouTube video, as well: https://www.youtube.com/watch?featur...VGpkan0rE#t=52.
Going to check BMA Parts for shipping price.
Maybe eeuroparts will price match.. or even FCPeuro.

I was going to order some other stuff for a spring job anyways so I guess this order just grew..

What else would I need to order along with this any sort of gaskets or anything?
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Old 03-26-2015, 09:10 AM   #10
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bump..
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Old 03-26-2015, 09:38 AM   #11
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What could it be? Not maintaining your car to full professional standards. Thankfully, I wrote information a long time ago to help you. Also check this out for new owners:


http://e46cooling.blogspot.com/2014/...appeal-of.html
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Old 04-02-2015, 07:52 AM   #12
jeepo23
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What could it be? Not maintaining your car to full professional standards. Thankfully, I wrote information a long time ago to help you. Also check this out for new owners:


http://e46cooling.blogspot.com/2014/...appeal-of.html
Wicked read.

However it does not talk about Fuel pump and what exactly is required.. all it mentions is a fuel filter.

Seems to go into detail with suspension & cooling refresh but that's of no use to me currently..
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Old 04-02-2015, 08:48 AM   #13
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Take note of your fuel level if it happens again before you get your new fuel pump.



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Old 04-02-2015, 08:51 AM   #14
jeepo23
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Take note of your fuel level if it happens again before you get your new fuel pump.



.
Yah I did.. same thing, Ever so slightly above half full. Coincidence?
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Old 05-06-2015, 04:37 PM   #15
jeepo23
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So brand new VDO pump installed and it appears this still is occurring - I'm approaching the half full tank again.

What could it be? I gotta monitor the rpm if happens to see how they behave
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Old 05-07-2015, 09:37 AM   #16
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anyone?
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Old 05-18-2015, 10:14 AM   #17
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Mine is starting to do the same. Could it be the sensor In the foot pedal is bad?
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Old 05-18-2015, 12:30 PM   #18
jeepo23
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Mine is starting to do the same. Could it be the sensor In the foot pedal is bad?

Where is this sensor and what does it do?

Can it be cleaned?

I ordered a fuel filter so I'm waiting for that to arrive and will be swapping it.
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