11-10-2018, 12:01 AM | #1 |
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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, 12:47 AM | #2 |
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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, 05:46 AM | #3 | |
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