Quote:
Originally Posted by RicheyBMW
Does anyone know if it hurts your car to run your gas tank that low?
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No one really knows.
It shouldn't hurt a properly designed car. However, there's a popular belief that due to a design error BMW cars should not be allowed to run lower on fuel that 1/4 of a tank. Otherwise, the service life of the fuel pump might get shortened considerably. Some people even claim that BMW service technicians recommend to fill up before it gets lower.
While BMW is indeed infamous for its fuel pump problems (that stretch far beyond "HPFP failure" issue), it is not clear whether this design error has been fixed or not in modern cars.