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General E46 Forum
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Old 06-23-2014, 08:53 AM   #1
jsdp
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Necessesary to change alternator + fuel filter with fuel pump?

I just changed the fuel pump out of my 2001 330ci after it died on me and was wondering if i needed to change the alternator and fuel filter with it?
Could the fuel pump potentially die with the old alternator?

I have plans to change the fuel filter in the next few weeks however I don't have much time at the moment so I have been delaying it.

Thanks
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Old 06-23-2014, 09:16 AM   #2
jfoj
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Change the fuel filter soon, it needs to be done anyway.

As for the fuel pump failing, it is time and it was just worn out, nothing to do with the alternator.

But if the car has the original alternator is may be time to change it or at least the brushes and Voltage regulator.
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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 06-23-2014, 09:31 AM   #3
dmax
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My Alt failed at around 250K miles. But, you should do your belts and pulleys if you haven't done them. Monitor your voltage when running using the cluster display. It will probably be low and at that point, I think it's just as easy to put in a remanned alt...and not have to worry about the alt's bearings going bad. Fuel filter is a good thing to do every four years or so...some probably do it sooner...but I've heard of them being so clogged at 130K miles that they stop the car.
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Old 06-23-2014, 10:33 AM   #4
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Ill be sure to do that soon, is it an easy diy? Thanks !
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Old 06-23-2014, 10:45 AM   #5
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Fuel filter is hard the first time, because everything is kind of seized if it's original. Be sure to get new clamps and new hose, 30R9 spec. I used 30R6 not knowing it couldn't handle the pressure and sure enough had a leak in about 1000 miles. Redid it in 30 minutes with the right stuff.
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Old 06-23-2014, 11:40 AM   #6
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I had a severe misfire on 3 cylinders when I got my car, due to a clogged up fuel filter.
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Old 06-24-2014, 08:39 AM   #7
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The first step for working on your alternator is to determine which alternator is in your car! Why? BMW sources 3 (!) different alternators for the E46:
- Bosch 80 amp
- Bosch 120 amp
- Valeo 80 amp

Remove the air filter housing and using a flashlight and a mirror read the label on the rear side of the alternator.

The VR in either Bosch alternator is replaceable. I got mine from FCPEURO for less than $40. Installation took about 30 minutes. The VR in the Valeo is NOT replaceable. You can't replace a Valeo with a Bosch unless you're swap the connector at the rear of the alternator. Also, the pulleys are different.


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Old 06-24-2014, 08:44 AM   #8
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Quote:
Originally Posted by markusmarkus View Post
The first step for working on your alternator is to determine which alternator is in your car! Why? BMW sources 3 (!) different alternators for the E46:
- Bosch 80 amp
- Bosch 120 amp
- Valeo 80 amp

Remove the air filter housing and using a flashlight and a mirror read the label on the rear side of the alternator.

The VR in either Bosch alternator is replaceable. I got mine from FCPEURO for less than $40. Installation took about 30 minutes. The VR in the Valeo is NOT replaceable. You can't replace a Valeo with a Bosch unless you're swap the connector at the rear of the alternator. Also, the pulleys are different
Need to add Valeo 120 Amp alternator to your list as well!! I just replaced one a few weeks ago and have the old one in my garage still.

FYI, if you need a Valeo, ECS had good pricing on brand new Valeo alternators and they drop ship quickly. This does not help the OP as he is not in the US, but may help others that run across this thread.

I was able to get mine the next day with standard shipping as the alternator was drop shipped from the same state I live in.
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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

Last edited by jfoj; 06-24-2014 at 08:45 AM.
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Old 06-24-2014, 02:25 PM   #9
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Quote:
Originally Posted by jsdp View Post
I just changed the fuel pump out of my 2001 330ci ...
how many miles ?
did you check the fuel pump relay to ......
Alternator [$150] = Bosch #AL0703X
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