E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 07-20-2014, 02:07 PM   #1
MacGyv3r
Registered User
 
Join Date: Dec 2011
Location: Canada
Posts: 24
My Ride: 320i (2001)
Replaced fuel pump = dead fuel gauge (Help?)

Followed a great guide here to proactively replace my fuel pump, and while the new pump works great my fuel gauge doesn't show correct readings anymore.

Tank was ~75% full, after install showed ~50%, and after some driving followed by a fill-up now shows almost 0. I'm afraid to take the car out...even though it basically has a full tank.

Can anyone shine any light on this?


Sent from BimmerApp mobile app
MacGyv3r is online now   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 07-20-2014, 10:03 PM   #2
cvx5832
Registered User
 
Join Date: Mar 2009
Location: Walnut Creek, CA
Posts: 2,044
My Ride: 325Ci, 325Cic, C300
Did you reconnect the left lobe connector, the one for the sucking jet pump?
__________________


cvx5832 is offline   Reply With Quote
Old 07-20-2014, 10:37 PM   #3
Stinger9
Registered User
 
Join Date: Sep 2011
Location: New York
Posts: 7,755
My Ride: '04 330Ci
Could just be you got a defective new fuel pump.

Or your connector is not making correct contact.
Stinger9 is offline   Reply With Quote
Old 07-20-2014, 11:08 PM   #4
MacGyv3r
Registered User
 
Join Date: Dec 2011
Location: Canada
Posts: 24
My Ride: 320i (2001)
Thanks for the replies, little worried here :/ I didn't see a left connector...I thought there is only the main connector with 4 prongs in it. Pretty sure its on fully...

The pump def. works right? (otherwise car wouldn't start)?

Sent from BimmerApp mobile app
MacGyv3r is online now   Reply With Quote
Old 07-20-2014, 11:15 PM   #5
cvx5832
Registered User
 
Join Date: Mar 2009
Location: Walnut Creek, CA
Posts: 2,044
My Ride: 325Ci, 325Cic, C300
Quote:
Originally Posted by MacGyv3r View Post
Thanks for the replies, little worried here :/ I didn't see a left connector...I thought there is only the main connector with 4 prongs in it. Pretty sure its on fully...

The pump def. works right? (otherwise car wouldn't start)?

Sent from BimmerApp mobile app
The left lobe has a connector too. It's only a level sensor. If it's disconnected, the pump will still run, but the cluster (hence gauge) will throw plausibility codes.

If you don't remember disconnecting it, your problem lay elsewhere.
__________________


cvx5832 is offline   Reply With Quote
Old 07-21-2014, 12:03 AM   #6
Stinger9
Registered User
 
Join Date: Sep 2011
Location: New York
Posts: 7,755
My Ride: '04 330Ci
Only one connector per side. One sender on the driver side and one on the passenger side.

Car runs means your pump is good. But part of the pump is also a fuel level sender. That is the part that might not be working.

There is a sliding lock clip on the connector as I recall. If that was locked, you probably have a solid connection.
Stinger9 is offline   Reply With Quote
Old 07-21-2014, 12:27 AM   #7
MacGyv3r
Registered User
 
Join Date: Dec 2011
Location: Canada
Posts: 24
My Ride: 320i (2001)
Going to try the hidden dash menu to see if I can further locate the source.

If the gauge hits 0, but I still have fuel in the tank, will the car still run? Or is there some electronic override?

Sent from BimmerApp mobile app
MacGyv3r is online now   Reply With Quote
Old 07-21-2014, 12:33 AM   #8
cvx5832
Registered User
 
Join Date: Mar 2009
Location: Walnut Creek, CA
Posts: 2,044
My Ride: 325Ci, 325Cic, C300
Quote:
Originally Posted by MacGyv3r View Post
Going to try the hidden dash menu to see if I can further locate the source.

If the gauge hits 0, but I still have fuel in the tank, will the car still run? Or is there some electronic override?

Sent from BimmerApp mobile app
No override.

If you have almost a full tank and either lobe reports 0, then you know you have a defective sender or connection.
__________________


cvx5832 is offline   Reply With Quote
Old 07-21-2014, 06:13 AM   #9
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 9,557
My Ride: '06 330CiC, '03 M5
So the question is what did you have for a part when you replaced your "fuel pump"?

Did you purchased just a fuel pump from a local auto parts store or did you purchased a Siemens/VDO pump already mounted a new sending unit so the complete assembly was replaced?

If you replaced just the pump on the original sending unit, this is very different than a complete replacement assembly.

The first thing I would guess at if you replaced the complete assembly that the float level arm was bent and is stuck in the low position.

Wait until the fuel level is down about 1/2 way, if you do not know how much fuel is in the tank, fill up the tank and drive about 150-200 miles and they tank will be about 1/2 to 1/3.
__________________
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
jfoj is online now   Reply With Quote
Old 07-22-2014, 03:34 PM   #10
MacGyv3r
Registered User
 
Join Date: Dec 2011
Location: Canada
Posts: 24
My Ride: 320i (2001)
Thanks guys, readings from hidden obc menu are:

238000 (6.0), 0238 (6.1), 0237 (6.2)

I assume this means the fuel pump level sensor is dead due to the 000 reading?

Sent from BimmerApp mobile app
MacGyv3r is online now   Reply With Quote
Old 07-22-2014, 03:40 PM   #11
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 9,557
My Ride: '06 330CiC, '03 M5
Did you fully seat/slide the bail connector onto the sending unit?

Did you buy a sending unit/pump combination or just a pump and reuse your old sending unit?
__________________
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
jfoj is online now   Reply With Quote
Old 07-22-2014, 03:49 PM   #12
jdstrickland
Registered User
 
Join Date: Apr 2010
Location: Murrieta, CA
Posts: 6,698
My Ride: '94 325iC & '00 323i
If something worked before you fixed it and did not work afterward, then you either fixed it wrong or used bad parts.
jdstrickland is offline   Reply With Quote
Old 07-22-2014, 06:39 PM   #13
amf
Registered User
 
Join Date: Mar 2014
Location: houston, tx
Posts: 35
My Ride: 2002 330i
if you replaced the sending unit fuel pump assembly under passenger rear seat....then you might have a stuck float arm. When I did mine and put the new assembly in I had this exact problem. I pulled out and found the float arm in a bind. Remove the assembly again and verify the float arm moves freely up and down. if it is moving roughly look at it close and you will see where the float arm is binding. good luck
amf is offline   Reply With Quote
Old Yesterday, 12:49 AM   #14
MacGyv3r
Registered User
 
Join Date: Dec 2011
Location: Canada
Posts: 24
My Ride: 320i (2001)
Thanks @amf, will check it as soon as tank is less full and report back!

Sent from BimmerApp mobile app
MacGyv3r is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 10:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use