How to diagnose and fix BMW E46 328i (M52TUB28) fuel pump issues?

Find and decode BMW E46 fault/error codes, access wiring schematics, and follow detailed repair manuals.
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spinecki
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Post by spinecki »

How to diagnose and fix BMW E46 328i (M52TUB28) fuel pump issues?

Symptoms of fuel pump failure:
  • Engine sputtering or stalling
  • Difficulty starting
  • Loss of power under acceleration
  • Whining noise from the rear of the car
Diagnostic steps:
  • Check fuel pressure using a gauge
  • Listen for pump operation when turning key to "on" position
  • Check fuel pump relay and fuse
  • Perform voltage drop test at the fuel pump
Replacement procedure:
  • Relieve fuel system pressure
  • Remove rear seat to access fuel pump
  • Disconnect electrical connections and fuel lines
  • Remove and replace fuel pump (part number: 16146766942)
  • Reassemble and test
Note: Always work in a well-ventilated area when dealing with fuel systems. Be prepared for some fuel spillage during replacement.
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