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E36 M3 (1995-1999)

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  #1  
Old 03-20-2012, 03:42 PM
ChuckG ChuckG is offline
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Location: Southern California
 
Join Date: May 2008
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Mein Auto: 99 M3
Fuel gauge is whack (replaced fuel level sensor)

Anyone have any idea what might be wrong?

My fuel gauge will randomly drop to empty, sit there for a while, then jump up to full tank and sit there for a while. Then eventually fall back to the actual fuel level... I thought for sure it was a faulty fuel level float sensor. Replaced it with a brand new one and it's still doing the same thing.
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1999 Cosmos M3 Coupe, TMS Stage4+ - Work in progress
2008 Interlagos M3 Coupe - Retired
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  #2  
Old 03-20-2012, 07:00 PM
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fun2drive fun2drive is offline
BMWCCA 149159
Location: Panhandle of Florida
 
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Mein Auto: 335 vert//M3/4/ 13Outback
You have two fuel level sensors. One on the pump side and one on the driver's side. You might see if the one you didn't replace is OK. Ohm test in Bentley gives you the values you should see empty and full. 10 ohms empty for each side and 250 ohms full each side Bentley page 160-5...
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Old 03-20-2012, 07:46 PM
BlackonBlackM3 BlackonBlackM3 is offline
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I have this same problem. It's highly annoying.
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  #4  
Old 03-21-2012, 09:01 AM
ChuckG ChuckG is offline
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Location: Southern California
 
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Quote:
Originally Posted by fun2drive View Post
You have two fuel level sensors. One on the pump side and one on the driver's side. You might see if the one you didn't replace is OK. Ohm test in Bentley gives you the values you should see empty and full. 10 ohms empty for each side and 250 ohms full each side Bentley page 160-5...
I replaced the one that is just a level sensor (driver side). It looks like the fuel pump is on the passenger side and it's a $330 part. Could it be that I really need to replace that whole thing just so my fuel gauge display's properly?
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  #5  
Old 03-23-2012, 08:04 AM
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fun2drive fun2drive is offline
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Did you do the ohm test as I suggested? No point in throwing parts at this if the ohm ranges are within spec.
Do the ohm test and tell us what you get...
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