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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

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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  #26  
Old 04-09-2012, 04:35 PM
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Quote:
Originally Posted by smolck View Post
Just one clamp, I use new ones as those snap on ones always seem to get "damaged" when I remove them.

This is a noteworthy update: The new fuel pump has made my car come alive again. I'll say that in my last E46 I had a dead pump and the car felt the same with the new one. But I must say, the one in this ZHP must have been "weak" since I got the car. But especially over the last 3 weeks. I would get 0171 and 0173 codes, the 4k rpm stutter had returned, and past 5000 rpm my car felt "weak". It just didn't pull after 5k rpm, it'd rev, but lamely.

Anyways ALL of those issues are GONE! My car pulls HARD all the way to redline, jumps right past 4k rpm with no stutter at all, and just feels way more peppy. I have nothing scientific to base this on, but I have a pretty big ass (some say it's on my shoulders) so my "butt dyno" takes a lot to register. The biggest things again are hard pulling from 5k-6800rpm and no more 4k rpm dip and those are EASILY felt.

So HAPPY! Too bad I changed my intake boots this weekend thinking they were the cause of my lean codes (they weren't cracked at all). But oh well, they are new now.
I also noticed an improvement in performance when I got a new pump. The clutch was prone to chattering when the car was cold, like there wasn't quite enough power and there was the feeling of uneven power in the lower ranges during shifts. After I got the new pump that went away.
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  #27  
Old 04-09-2012, 05:23 PM
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Shad. How hard would you say the fuel pump is to DIY?. Is it harder or easier than say a diff swap?.
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  #28  
Old 04-09-2012, 05:25 PM
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Quote:
Originally Posted by MalibuMafiaV View Post
Shad. How hard would you say the fuel pump is to DIY?. Is it harder or easier than say a diff swap?.
It's so easy it isn't even funny. Took me about 15 minutes. You remove the lower back seat, remove 4 10mm bolts that hold the cover on, unsnap the electrical connection, remove a clamp and a hose and then hammer the retainer ring out. It is a joke. So on a scale of 1-10 it is a 1.
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  #29  
Old 04-09-2012, 05:35 PM
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Quote:
Originally Posted by smolck View Post
It's so easy it isn't even funny. Took me about 15 minutes. You remove the lower back seat, remove 4 10mm bolts that hold the cover on, unsnap the electrical connection, remove a clamp and a hose and then hammer the retainer ring out. It is a joke. So on a scale of 1-10 it is a 1.
hahahaha awesome! do I have to worry about spilling gasoline every where?. That might not be good. I feel like mine needs some help considering it has 181k miles on it. Wow I wonder if some of my problem is going to be fuel pump related.... never really thought about it since I got lean codes... would make sense since my AFRs were all horrible to especially if the car was starving for fuel. The car was idling oddly as well.
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Last edited by MalibuMafiaV; 04-09-2012 at 05:39 PM.
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  #30  
Old 04-09-2012, 05:57 PM
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Quote:
Originally Posted by smolck View Post
It's so easy it isn't even funny. Took me about 15 minutes. You remove the lower back seat, remove 4 10mm bolts that hold the cover on, unsnap the electrical connection, remove a clamp and a hose and then hammer the retainer ring out. It is a joke. So on a scale of 1-10 it is a 1.
The toughest part of the job was figuring out whether the seal ring should go on the tank or on the pump when reinstalling the assembly. If I recall, you have to put the seal ring on the tank to get it to seat properly.
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  #31  
Old 04-09-2012, 07:02 PM
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Quote:
Originally Posted by MalibuMafiaV View Post
Shad. How hard would you say the fuel pump is to DIY?. Is it harder or easier than say a diff swap?.
Van, here is a DIY I found on YouTube... as soon as I read Smolck's first post I started looking for DIYs

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  #32  
Old 04-09-2012, 07:06 PM
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This is so easy that you can do it in less time than it takes to load and watch the video.
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  #33  
Old 04-10-2012, 12:21 AM
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It's only easy if everything comes off as planned. When I installed the M3 fuel pump baffle into my 330ci, it took quite a bit of effort getting the lock-down ring to come loose even though I did it exactly as demonstrated in the video.
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  #34  
Old 04-10-2012, 04:31 AM
alfabmw1 alfabmw1 is offline
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I have had two no-starts in the last 6 months, this may be the culprit. I just checked for pumps on-line, it looks like there are two, one on the left (drivers side), and one on the right (for 2001 325 XI). The video shows the one on the right being replaced, it is also the expensive one. I assume that is the one to go with?
Thanks!
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  #35  
Old 04-10-2012, 04:48 AM
gesoffen gesoffen is offline
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For all those who had to replace fuel pumps: What was your PM schedule on fuel filters?
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  #36  
Old 04-10-2012, 06:11 AM
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I have had two no-starts in the last 6 months, this may be the culprit. I just checked for pumps on-line, it looks like there are two, one on the left (drivers side), and one on the right (for 2001 325 XI). The video shows the one on the right being replaced, it is also the expensive one. I assume that is the one to go with?
Thanks!
The fuel pump is on the right had side (passenger). The left side pump isn't a fuel pump exactly, it is called a sucking jet pump. It sends fuel to the other side of the tank, rarely do they fail, but if you order a "fuel pump" it will be for the back passenger side.

Quote:
Originally Posted by gesoffen View Post
For all those who had to replace fuel pumps: What was your PM schedule on fuel filters?
I changed the fuel filter twice on the ZHP before I bought it for the PO. Once around 70k miles and again at 130k miles or so.
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  #37  
Old 04-10-2012, 06:57 AM
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For all those who had to replace fuel pumps: What was your PM schedule on fuel filters?
The parts distributor I bought my fuel pump from also requires you to buy and install a new filter to get the full warranty. My old filter only had about 4000 miles on it so I put the new one in my spare parts collection.
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Last edited by catso; 04-10-2012 at 08:52 AM.
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  #38  
Old 04-10-2012, 07:06 AM
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Quote:
Originally Posted by smolck View Post
The fuel pump is on the right had side (passenger). The left side pump isn't a fuel pump exactly, it is called a sucking jet pump. It sends fuel to the other side of the tank, rarely do they fail, but if you order a "fuel pump" it will be for the back passenger side.
Correct me if I am mistaken, but I thought the "sucking jet pump" was something different, submerged down at the bottom of the fuel tank, which, as you say, moves gas to the passenger side of the tank. I think the round pump-type thing under the rear drivers side seat is the level sender, which (I learned recently) should be replaced if your gas gauge is acting funny.
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  #39  
Old 04-10-2012, 07:10 AM
oembimmerparts oembimmerparts is offline
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E46 pumps are failing very often at the moment, To give you a idea we are at between 15-25 per week and it does not seem to be slowing down any.

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  #40  
Old 04-10-2012, 07:27 AM
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Mine died on Friday at ~141k miles. New pump arriving today.
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  #41  
Old 04-10-2012, 08:47 AM
Dibaltic Dibaltic is offline
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my buddies fuel pump died on him just last week at i believe about 145k
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  #42  
Old 04-10-2012, 09:38 AM
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Quote:
Originally Posted by JJ3699 View Post
Van, here is a DIY I found on YouTube... as soon as I read Smolck's first post I started looking for DIYs

Thanks man!. Definitely going to do this next pay check.
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  #43  
Old 04-10-2012, 10:01 AM
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Any idea of the brand and type of gas used contributes to the pump failure? Or if the tank has ever run dry which my cause the pump to overheat from an empty fuel tank?
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  #44  
Old 04-10-2012, 10:55 AM
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Perhaps this is something that should be added to the Wiki? I didn't see anything in there on fuel pumps, other than a mention that replacing your fuel filter will help prolong the life of your pump. But with so much emphasis on a cooling system that will fail like clockwork every 90k miles and leave you stranded, might be a good idea to note the same thing for a fuel pump that will fail like clockwork every 140k miles and leave you stranded.
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  #45  
Old 04-10-2012, 11:14 AM
ckleung100 ckleung100 is offline
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I wish they had an access door to make the CVV so easy to replace too.
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  #46  
Old 04-10-2012, 11:37 AM
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I wish they had an access door to make the CVV so easy to replace too.
CVV isn't to hard to replace anyways:P just time consuming.
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  #47  
Old 04-10-2012, 11:55 AM
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Glad you got her fixed, VDO makes a great quality pump for a fraction of the cost of the genuine BMW pump.

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Originally Posted by smolck View Post
I still can't believe the ONE TIME I leave my cell phone at home my car dies.
That's the way it always happens!
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Last edited by ECSTuning; 04-10-2012 at 12:03 PM.
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  #48  
Old 04-10-2012, 12:01 PM
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Glad you got her fixed, VDO makes a great quality pump for a fraction of the cost of the genuine BMW pump.


That's the way it always happens!
Wonder what I can fit in there that's not OEM spec. Like more of a beefy fuel pump for my SCed bimmer.... any thoughts?
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BMW 2006 M3 - stock - SOLD
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  #49  
Old 04-10-2012, 12:11 PM
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Originally Posted by MalibuMafiaV View Post
Wonder what I can fit in there that's not OEM spec. Like more of a beefy fuel pump for my SCed bimmer.... any thoughts?
Walbro pumps are rather popular with the boosted crowed.
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  #50  
Old 04-10-2012, 01:18 PM
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Walbro pumps are rather popular with the boosted crowed.
That's what I was thinkin. Although I think I'll probably still just go with OEM to be safe.
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