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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 01-27-2011, 10:37 AM
Magoo43 Magoo43 is offline
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Location: Texas
 
Join Date: Mar 2010
Posts: 30
Mein Auto: 94 BMW 318is
Fuel sending unit

Is the sending unit and the fuel pump 1 unit? And how do you find it and get access to it
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  #2  
Old 01-27-2011, 10:59 AM
sisspc sisspc is offline
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Location: Manchester, TN
 
Join Date: Apr 2009
Posts: 247
Mein Auto: '06 330i
Yes, sending unit/fuel pump are the same thing on our cars. There is a level sensor as well but I don't recall ever hearing about one of those going bad.

Here is a diy for both. This is the easiest diy I've done, it took me 20 minutes max. Most people also recommend doing the fuel filter when you do the fuel pump. Good luck!

http://forum.e46fanatics.com/showthread.php?t=592414
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Old 01-27-2011, 05:56 PM
Magoo43 Magoo43 is offline
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Location: Texas
 
Join Date: Mar 2010
Posts: 30
Mein Auto: 94 BMW 318is
Thank you alot, I am new to the 323, previously 1994 318is. Where is the best place to buy from and is it located under the rear seat as I have been told by one person?
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Old 01-28-2011, 11:20 PM
KenG KenG is offline
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Location: Huron, (Central) California
 
Join Date: May 2010
Posts: 609
Mein Auto: 00' 323ci 5sp mt
I have a 2000 323ci and I had to replace the fuel pump and as mentioned by sisspc its under the back seat (just pull up and it should pop up fine) I'm not sure if it was the fuel pump or the sending unit but I replaced the one on the passenger side. Just make sure you have a bucket next to you I pulled out the pump and gas leaked onto the carpet...

It is pretty simple tho

got mine for around $150

Last edited by KenG; 01-28-2011 at 11:21 PM.
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Old 01-29-2011, 06:03 PM
Magoo43 Magoo43 is offline
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Location: Texas
 
Join Date: Mar 2010
Posts: 30
Mein Auto: 94 BMW 318is
Smile Sending unit

Thank you a lot for the help, I am going to give it a shot this next week and see if I can do it.
I really appreciate the support messages,
Magoo43
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Old 01-30-2011, 01:03 AM
jcourcoul jcourcoul is offline
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Location: Mexico
 
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Posts: 5,192
Mein Auto: 2006 325Ci
Since the gas tank straddles the driveshaft, it hangs like saddlebags on horses. On one side you have the fuel pump that sends gas to the filter/regulator and on to the engine. On the other side there is a siphon that transfers the fuel to the pump side. Both units have a float and a level sensor. The fuel gauge shows you the buffered total of both levels. If you want to see what each sensor is sending, use function 6.0 of the Hidden Onboard Computer Functions.
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