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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #76  
Old 06-14-2012, 01:38 PM
cvx5832 cvx5832 is offline
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I've seen these pumps fail more based on time than mileage. The pump went out on my 2003 325Ci with only 88k miles, driven mostly on freeways and on weekends, and that's with a fuel filter replacement at 50k.

I've always avoided including the pump as a maintenance item because I figured I always took care of it with scheduled filter replacements. I don't drive like a lunatic, either. But after mine started to make noise and failed, further research indicates they just conk out after a number of years submerged in fuel.
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  #77  
Old 11-13-2012, 10:33 AM
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mlukas161 mlukas161 is online now
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Will a fuel pump throw a code at all after it fails?
I think mine on my 330i just died today at work. T
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  #78  
Old 11-13-2012, 11:41 AM
jdauria jdauria is offline
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Quote:
Originally Posted by mlukas161 View Post
Will a fuel pump throw a code at all after it fails?
I think mine on my 330i just died today at work. T
I think it should but dont quote me on that. It'll be obvious if it fails, your car wont turn on no?
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  #79  
Old 11-13-2012, 12:10 PM
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Scottji Scottji is offline
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Did you pull the rear seat and listen for it to wind up when you turn the key to "on" (but not "start")?
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  #80  
Old 11-13-2012, 12:35 PM
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1972ford 1972ford is offline
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Quote:
Originally Posted by jdauria View Post
I think it should but dont quote me on that. It'll be obvious if it fails, your car wont turn on no?
Mine failed initially without warning. Drove it for 35 min, shut the car off and went to re-start 15 min later, all it would do is fire then die right away. It came to life after some encouragement and I drove it another 150 miles, though it did cause a misfire and poor run condition momentarily, which then tripped the CEL but this is 100+ miles after the first failure. Obviously not my first choice to keep driving it that way but I had no better option at the time.

If it had failed slowly it might have caused the CEL and misfire first, which could have actually thrown me on a wild goose chase. I'm kinda glad it failed the way it did.

oh and yes, what Scott said - if it's working you'll hear the hum for a few seconds under the rear seat when you first turn the key to 'on.'
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  #81  
Old 11-13-2012, 12:45 PM
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mlukas161 mlukas161 is online now
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Thanks all. It definitely is the fuel pump.

I pulled the back seat up and there is no noise and no movement in the fuel pump. Also, I checked all fuses and swapped relays under the hood with my horn relay just to make sure it wasn't something electrical.

I hit the top of the fuel pump with a long wrench and sure enough it started right up.
I was able to get it home and in my garage.

Looks like I'll be ordering a new fuel pump today.

FWIW I have a 2003 330i with 88,000 miles.
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  #82  
Old 11-13-2012, 03:16 PM
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MalibuMafiaV MalibuMafiaV is offline
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I would like to state that I'm still on my original fuel pump at 184k miles. My next post might be "DIYing fuel pump".
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  #83  
Old 11-14-2012, 05:31 AM
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1972ford 1972ford is offline
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Originally Posted by MalibuMafiaV View Post
I would like to state that I'm still on my original fuel pump at 184k miles. My next post might be "DIYing fuel pump".
haha, is that the last original mechanical part on that car?

The DIY is really easy: remove back seat, remove cover plate, disconnect wire harness, disconnect fuel hose, unscrew big retaining ring, remove pump & gasket, install new, screw down retaining ring, connect fuel line (recommend new hose clamp) and wire harness, replace cover plate, replace back seat. 10 minutes start to finish.
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  #84  
Old 11-14-2012, 08:29 AM
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MalibuMafiaV MalibuMafiaV is offline
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Quote:
Originally Posted by 1972ford View Post
haha, is that the last original mechanical part on that car?

The DIY is really easy: remove back seat, remove cover plate, disconnect wire harness, disconnect fuel hose, unscrew big retaining ring, remove pump & gasket, install new, screw down retaining ring, connect fuel line (recommend new hose clamp) and wire harness, replace cover plate, replace back seat. 10 minutes start to finish.
LOL. That and the power steering pump are the only original parts left. Yeah the DIY looks super easy. I drove the car yesterday night to go get some food. GOOD LORD every time I get in my bimmer it's a blast to drive and it's FAST as **** compared to the masi. Masi is fast after about 50 mph when it's rolling. But the bimmer.... that **** is so damn fast from 0-80 it's scarry. Plus the sounds it make, super charger whistle and the bypass valve air noise like a blow off valve
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  #85  
Old 11-14-2012, 10:18 AM
nivo nivo is offline
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The amazing thing is that this is a common thing on some BMWs, while other cars get scrapped with over 300k miles and not one issue.

The pump as tested by some manufacturers is by run time hours not miles. Also the higher the voltage to the pump and the higher the pressure the shorter the life. being that they run at 3.5bar...well this tells us something.
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  #86  
Old 11-14-2012, 10:56 AM
nekkibasara nekkibasara is offline
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Originally Posted by nivo View Post
The amazing thing is that this is a common thing on some BMWs, while other cars get scrapped with over 300k miles and not one issue.

The pump as tested by some manufacturers is by run time hours not miles. Also the higher the voltage to the pump and the higher the pressure the shorter the life. being that they run at 3.5bar...well this tells us something.
I wonder if the short lifespan of these plastic parts has anything to do with the excessively corrosive ethanol that is in all of our fuel now.
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