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      11-15-2011, 08:10 AM   #1
tlrominger
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Fuel Guage only half of what it should.

Hello everyone. I have seen this problem on a few other posts with no real answer, but they were all pretty old. So, I am bringing it up again. I have a 2005 3.0i that is haveing a fuel guage issue. When filled up it reads only half full. The guage cluster selfcheck shows a full sweep on the guage and the sending unit has been replaced with no luck. Is there a way for the calibration to be messed up on the guage? Also all the wiring checks good with on faults. Thanks for any input.
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      11-15-2011, 09:30 PM   #2
Hogndos
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Does the fuel tank take a complete fill when empty?...I had a buddy with a 911 Carrera where the filler vent tube somehow got pinched, causing the fuel tank to actually collapse thus causing an errant gauge reading and of course, a considerably smaller fuel cell....
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      11-15-2011, 10:20 PM   #3
tlrominger
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The tank takes all the fuel it should. The gage just reads all the levels has half. The computer in the gage cluster reads half for miles to empty too.
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      11-29-2011, 01:05 PM   #4
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I found the answer...
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      11-29-2011, 05:45 PM   #5
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The answer is ???????
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      11-30-2011, 01:12 AM   #6
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      11-30-2011, 04:25 PM   #7
tlrominger
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I wanted to test it out before posting...BMW uses the same sending units in seveal different models. Including the ones that have 2 sending units. I this model the 2 units send a signal that is registered as one on the fuel gage. On Z4's which only have one the sending unit needs to be coded to read correctly. This is why the fuel gage was reading only half of what it should. A bit of computer time and the gage now reads correct.
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