What are the causes of fuel supply system failure in BMW 523?

1 Answers
McMiles
07/30/25 8:23am
BMW 523 fuel supply system failure may be caused by issues with the fuel supply system wiring or low oil pressure. The specific causes and solutions are as follows: Fuel supply system wiring issues: The power harness of the electric fuel pump may interfere with the pressure regulating valve on the fuel delivery unit. During vehicle use, this can lead to harness damage and, in specific cases, may cause internal short circuits. The solution is to inspect the system wiring and perform repairs. Low oil pressure: If there is a leak in the oil circuit or the engine oil storage is insufficient, the oil pressure may drop too low, causing the fuel supply system to malfunction. The solution is to top up the oil.
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