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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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  #1  
Old 06-10-2009, 02:24 PM
sexy_roman21 sexy_roman21 is offline
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Question changed my fuel pump, increased my MPG, how ???

i recently changed my fuel Pump (not the filter)
and got a big boost in fuel economy.
how is it possible.
if you looked at my previous post you can see i complained of bad MPG.
i will soon change my fuel filter and VANOS seal and will enjoy 20 mpg City
its 17-18 now. mostly city.

please see my other recent post about a missing o-ring gasket in fuel pump/tank combo.
possible solution?

Last edited by sexy_roman21; 06-12-2009 at 02:44 PM.
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  #2  
Old 06-10-2009, 07:57 PM
sulkesbmw sulkesbmw is offline
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Mein Auto: bmw 328 is
i get 21 mpg city! what kind of gas u use?
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  #3  
Old 06-10-2009, 09:39 PM
scoodaz scoodaz is offline
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Out of curiosity! how much was the cost of changing the fuel pump!
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  #4  
Old 06-10-2009, 09:40 PM
ThreeTwoFive ThreeTwoFive is offline
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I get like 14-15 MPG city...it depends on what kind of city...(mine has a traffic light every 30 sec)
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  #5  
Old 06-11-2009, 12:30 AM
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CaptainTrap CaptainTrap is offline
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Mein Auto: 2001 330i 5MT ZSP
i average 18 MPG city driving and that is the only kind of driving i do. it is spirited driving tho...
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  #6  
Old 06-11-2009, 07:13 AM
3beemers 3beemers is offline
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Originally Posted by CaptainTrap View Post
i average 18 MPG city driving and that is the only kind of driving i do. it is spirited driving tho...
I get 23-24 city. Good for my pocket, Not good for the car, it becomes sluggish so sometimes I find the right time and place to open it up in manual mode 4th gear near the redline. I do not use the a/c in stop and go traffic to lessen the load and heat of the engine. When I get home, I leave the hood up in the garage to vent the heat.
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  #7  
Old 06-11-2009, 10:05 AM
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CaptainTrap CaptainTrap is offline
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Quote:
Originally Posted by 3beemers View Post
I get 23-24 city. Good for my pocket, Not good for the car, it becomes sluggish so sometimes I find the right time and place to open it up in manual mode 4th gear near the redline. I do not use the a/c in stop and go traffic to lessen the load and heat of the engine. When I get home, I leave the hood up in the garage to vent the heat.
strange how we have the same car/year and your mileage is so much better than mine. BTW you should think about investing in a vented hood if you leave it up after a drive every time. Looks cool and is practical

picture courtesy of jlevisw.com
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  #8  
Old 06-11-2009, 10:32 AM
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phlfly phlfly is offline
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I have 2003 auto 325i, I'm driving stop and go traffic for 10 miles and then straight line for 1 mile, where I go about 70-75 m/h.
So I'm getting avg. 17.5-19 mpg. Is it too low? I thought a little low for 2.5l engine. Fuel filter, spark pugs and fuel pump, can't help? I have changed filter and cleaned MFS.
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  #9  
Old 06-11-2009, 11:02 AM
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phoenixreborn phoenixreborn is offline
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OMG, is anyone going to answer the question and not turn this into yet ANOTHER mpg thread?
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  #10  
Old 06-11-2009, 11:12 AM
3beemers 3beemers is offline
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Quote:
Originally Posted by phlfly View Post
I have 2003 auto 325i, I'm driving stop and go traffic for 10 miles and then straight line for 1 mile, where I go about 70-75 m/h.
So I'm getting avg. 17.5-19 mpg. Is it too low? I thought a little low for 2.5l engine. Fuel filter, spark pugs and fuel pump, can't help? I have changed filter and cleaned MFS.
To get my average mpg on all my vehicles/motorcycles, I created an excel sheet to record all my gas purchases, miles, price per gallon since early 2000. I do not rely on the car's instrument although it is pretty close. I also zero out the car's mpg once in a while. The mpg tremedously improved after replacing the cam sensor, spark plugs and fuel filter.

My style of driving, not in a hurry to get to the next light. It is like playing a game on the streets. See how I can time the lights to get as many greens as possible. Most cities seldom change the timing on these lights. I normal know how many blinks for each lights before it turns to yellow/red to give me the decision to catch up or slow down.

On the freeways I have reached the 3 digits just to unclog the engine and where it is safe. I normally drive nights or early morning like 3 am to head out town for the weekend. Freeways are pretty much free except for truckers. I just give them a lot of space and it works fine.

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  #11  
Old 06-11-2009, 11:15 AM
mrodoc mrodoc is offline
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Funny, you should post this thread. I have noticed that for the last couple of months my gas mileage in my 525i E34 has dropped. I redid the Vanos and changed the plugs as it was hesitating a little on accelaration, and changed the fuel and air filter. It ran better by far, but still idled a little rough, and the mileage was still poor, about 2.5 mpg lower in my usual mixed driving. I have calculated it every tank full for 184k miles.
Then, I was at McDonald's with my kids and it wouldn't start. Had it flatbedded and it was diagnosed with a dead fuel pump. With the new fuel pump the idle is now like new and after two tanks of gas, my mileage is back up to where it has been for the last 14 years.
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  #12  
Old 06-11-2009, 11:53 AM
3beemers 3beemers is offline
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Originally Posted by mrodoc View Post
Funny, you should post this thread. I have noticed that for the last couple of months my gas mileage in my 525i E34 has dropped. I redid the Vanos and changed the plugs as it was hesitating a little on accelaration, and changed the fuel and air filter. It ran better by far, but still idled a little rough, and the mileage was still poor, about 2.5 mpg lower in my usual mixed driving. I have calculated it every tank full for 184k miles.
Then, I was at McDonald's with my kids and it wouldn't start. Had it flatbedded and it was diagnosed with a dead fuel pump. With the new fuel pump the idle is now like new and after two tanks of gas, my mileage is back up to where it has been for the last 14 years.
DIY fuel pump? With almost 9 years old car, I should be watching this.

Regards
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  #13  
Old 06-11-2009, 12:04 PM
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KrisL KrisL is offline
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Quote:
Originally Posted by 3beemers View Post
When I get home, I leave the hood up in the garage to vent the heat.

Why do you think this is good? If you go on another drive within a few hours, having your engine hot will INCREASE your mileage!
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  #14  
Old 06-11-2009, 12:06 PM
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KrisL KrisL is offline
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Quote:
Originally Posted by 3beemers View Post
DIY fuel pump? With almost 9 years old car, I should be watching this.

Regards
It's a breeze, search for my posts about the M3 fuel tank baffle.. procedure is the same. You just remove the access door under the driver's seat and swap it out.
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  #15  
Old 06-11-2009, 12:16 PM
3beemers 3beemers is offline
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Originally Posted by scoodaz View Post
Out of curiosity! how much was the cost of changing the fuel pump!
I checked autohaus and it is now on sale for $142.00. Not sure about DIY, let me know what you'll find out.

Regards
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  #16  
Old 06-11-2009, 12:18 PM
3beemers 3beemers is offline
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Originally Posted by KrisL View Post
It's a breeze, search for my posts about the M3 fuel tank baffle.. procedure is the same. You just remove the access door under the driver's seat and swap it out.
Thanks Kris.
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  #17  
Old 06-11-2009, 01:02 PM
Melquin Melquin is offline
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Quote:
Originally Posted by KrisL View Post
It's a breeze, search for my posts about the M3 fuel tank baffle.. procedure is the same. You just remove the access door under the driver's seat and swap it out.
Umm...
I have difficulty reaching the pedals if I put the seat back that far.
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  #18  
Old 06-11-2009, 01:04 PM
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KrisL KrisL is offline
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Originally Posted by Melquin View Post
Umm...
I have difficulty reaching the pedals if I put the seat back that far.
haha whoops. I meant to say back seat .
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  #19  
Old 06-11-2009, 01:49 PM
tk4454 tk4454 is offline
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i keep heAring what everyone is getting for mpg but im curious what i should be getting i have a 2000 328i and im getting a little over 20.5 mpg, should i be getting more or is that typical?
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  #20  
Old 06-11-2009, 01:50 PM
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kimmy kimmy is offline
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Quote:
Originally Posted by scoodaz View Post
Out of curiosity! how much was the cost of changing the fuel pump!
See that you have a 325 in Cali.
I certainly hope that you have the M54 engine. If you are unfortunate enough to have an SULEV M56, you have my sympathies as you're looking at >$6000 just for parts for the fuel pump/tank, let alone labor for complete tank replacement.
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  #21  
Old 06-11-2009, 01:55 PM
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KrisL KrisL is offline
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Quote:
Originally Posted by tk4454 View Post
i keep heAring what everyone is getting for mpg but im curious what i should be getting i have a 2000 328i and im getting a little over 20.5 mpg, should i be getting more or is that typical?
there's only about 50 different variables that need to be considered, the driver being #1. 17 to 33 is "in the range".
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  #22  
Old 06-11-2009, 02:04 PM
tk4454 tk4454 is offline
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thanks for the answer, guess im doing fine in that department then, now if only my key fobs werent ****in up
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  #23  
Old 06-12-2009, 05:43 AM
BalticVid BalticVid is offline
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2005 330i ZHP 38,000 miles 20 MPG around the city.

Havn't had a good road test yet.
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Last edited by BalticVid; 06-12-2009 at 04:40 PM.
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  #24  
Old 06-12-2009, 06:39 AM
jcourcoul jcourcoul is offline
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Quote:
Originally Posted by KrisL View Post
It's a breeze, search for my posts about the M3 fuel tank baffle.. procedure is the same. You just remove the access door under the driver's seat and swap it out.
That's one of the features I fell in love as soon as I learned about it. In all my previous Ford cars that had an electric fuel pump, changing it meant dropping the tank, which entailed dropping the drive shaft plus a zillion cables, hoses and fasteners, all of which was a very major PITA.
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  #25  
Old 06-12-2009, 02:47 PM
sexy_roman21 sexy_roman21 is offline
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Quote:
Originally Posted by 3beemers View Post
I checked autohaus and it is now on sale for $142.00. Not sure about DIY, let me know what you'll find out.

Regards
i unfortianly did not find any DIY regarding the fuel pmp change i had to figure it out on my own. i posted on craigslist a special tool request and people tell me i dont need it and gave me advice how to do it, its not that hard, you just need streitgh.(i know i misspelled it)
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