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      11-10-2018, 01:01 AM   #1
spierce
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Fuel level issues

I drove my car home ~400mi and arrived with 1/4 tank. However, when I started my car it was on "emergency reserves". That hasn't happened again but half the time I fill it up it shows 3/4 tank rather than full. I am going to bring it in for warranty service but was wondering if there was something specific I can point to.

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      11-10-2018, 01:47 AM   #2
DuSh
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Not a common issue. There are 2 tanks (left and right) connected with each other making it essentially 1 big tank. Fuel is transferred (pumped) from 1 tank to another based on special bmw algorithm. Each side has it's own fuel level sensor submerged into fuel. If one sensor is bad - it's possible you might experience those symptoms. If both sensors are bad - car will calculate fuel using either fuel injectors signal or consumption signals - it's complicated system. However, if there are some errors - they will be stored in unit memory. So short answer, since you are on warranty - just go to dealer and let them pull codes. Fuel level sensor is easy to swap - there's access under the rear seat cushion, so dealer will replace it in no time.
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      11-10-2018, 06:46 AM   #3
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Quote:
Originally Posted by DuSh View Post
Not a common issue. There are 2 tanks (left and right) connected with each other making it essentially 1 big tank. Fuel is transferred (pumped) from 1 tank to another based on special bmw algorithm. Each side has it's own fuel level sensor submerged into fuel. If one sensor is bad - it's possible you might experience those symptoms. If both sensors are bad - car will calculate fuel using either fuel injectors signal or consumption signals - it's complicated system. However, if there are some errors - they will be stored in unit memory. So short answer, since you are on warranty - just go to dealer and let them pull codes. Fuel level sensor is easy to swap - there's access under the rear seat cushion, so dealer will replace it in no time.
Interesting! I did not know this.
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DuSh1498.00

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