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Old 12-09-2013, 12:42 PM   #1
coreyaugustus
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Fuel pump replacement/upgrade

The time has come for me to replace the fuel pump on my e46 M3. Before I buy parts, I was curious if there are any reasonable upgrades over stock. It's in stock format now (no supercharging or turbocharging) and I'd rather not change injectors or anything like that.

Basically, I'm looking for quality and reliability over stock. Any suggestions?
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Old 12-09-2013, 01:01 PM   #2
jfoj
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Some folks replace the pump with Walbro's or the other competitor, but the M pumps are pretty good and run at a much higher pressure than the non M cars.

If you do not use a OE pump, a bit of creativity is needed to get the pump mounted and set up in the pump hanger.
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Old 12-09-2013, 01:10 PM   #3
coreyaugustus
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Quote:
Originally Posted by jfoj View Post
Some folks replace the pump with Walbro's or the other competitor, but the M pumps are pretty good and run at a much higher pressure than the non M cars.

If you do not use a OE pump, a bit of creativity is needed to get the pump mounted and set up in the pump hanger.
Thanks for the reply jfoj. I actually saved your fuel pump thread for reference on this issue, so you've been doubly helpful!
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Old 12-09-2013, 02:15 PM   #4
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Quote:
Originally Posted by coreyaugustus View Post
Thanks for the reply jfoj. I actually saved your fuel pump thread for reference on this issue, so you've been doubly helpful!
Areomotive is the other pump folks tend to use a lot along with the Walbro.

I think they each have 3 different fuel sock connections. But I also recall you will have to get creative with the pump diameter and the M fuel pump carrier?

Not sure you will need an upgraded pump, but something to consider, the M pumps are not cheap like the non M pumps.
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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 12-09-2013, 02:18 PM   #5
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I replaced my original pump within the year...say around 240K miles (and it was working fine at the time). I put in another OE. I'm not sure how having more pressure than you need, or dealing with futzing around with alternative, creative fittings is necessary at all...and if you get it wrong, you know...well...you know.
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Old 12-09-2013, 02:23 PM   #6
coreyaugustus
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That was something I had to consider when I was contemplating the M. Everything is 3x more expensive to fit the M car. Now just to pull out my wallet and bend over...

I don't really need an upgrade. Was hoping for something with a rep for being sturdier (like how when you're doing a water pump repair, you replace with a Stewart pump instead of OEM). The upgrades I've made to the car have been mild ones. Konis instead of OEM shocks/struts, non-SAC pressure plate on the clutch job, etc.
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Old 12-09-2013, 04:52 PM   #7
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Check www.bmwmercedesparts.com they have pretty good pricing, not sure if you can do much better, but for the OE pump not a bad price.

You could try to email www.bmaparts.com and see if they can get you one at a better price, you pay a premium for everything via the dealer for the 24 Month/Unlimited Mileage warranty.

OEM parts purchased outside the dealer network do not have the 24/Unlimited mileage but are usually the same part and/or vendor.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

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Old 12-09-2013, 09:49 PM   #8
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Fuel pump replacement/upgrade

What's a reasonable PM interval for the fuel pump? 150k? 200k?
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Old 12-09-2013, 10:57 PM   #9
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I feel it is a lot less about mileage than hours or age.

The fuel pump is running the entire time engine is operational. So sitting in stop and go traffic, few miles are put on the car but many hours.

I feel 8 years is a good time window.

It seems the pre 2002 pumps may last longer, but nothing scientific, just based on comments of the earlier cars. Maybe a different pump vendor or design?
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-10-2013, 09:23 AM   #10
coreyaugustus
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Thanks for the vendor recommendation. I usually use ecstuning.com but they were at $326 for the pump vs $275 at bmwmercedesparts.com. I'll keep them in mind for future repairs.

As for data points on replacement, this is the first one I've had to do on any of my vehicles, so all I can add to that average is this replacement date. My M3 was built in April of 2004 and has 135,xxx miles on the odometer.
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Old 12-10-2013, 09:44 AM   #11
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If you think about it, there's no reason to look for an upgraded pump. Your original lasted 135,000 miles. Are you really going to keep the car until 260,000 miles?
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Old 12-10-2013, 09:54 AM   #12
coreyaugustus
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That's a fair point, WDE46. That's a reasonably good life span. But yeah, I'll probably keep the car that long if the motor lasts. It's really good looking and fun to drive. Besides, I've got plenty of space for it and others.
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