Both fuel pumps bad?

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  • ANDRÜ
    E30 Enthusiast
    • Aug 2006
    • 1020

    #1

    Both fuel pumps bad?

    I picked up a euro spec 320i not long ago and am finally starting some maintenance. Its not getting any fuel. On my eta, I remember when I turn the ignition on, the fuel pump (infront of the drivers rear wheel) hummed. This one just clicks once as soon as the ignition is on. The in-tank pump doesnt seem to make any noise. Im going to pull both of these soon and test them out of the car, but does anyone know much about how these are supposed to act in normal conditions?
  • jlevie
    R3V OG
    • Nov 2006
    • 13530

    #2
    The normal operation is for the pumps to be powered up only when the DME sees timing data from a rotating engine. To test the pumps you can jumper the fuel pump relay socket.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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    • TurboJake
      No R3VLimiter
      • Oct 2010
      • 3780

      #3
      Originally posted by jlevie
      The normal operation is for the pumps to be powered up only when the DME sees timing data from a rotating engine. To test the pumps you can jumper the fuel pump relay socket.
      ^That. The E30 doesn't run the pump with just the key in the on position. Chances are your ETA was forced to run whenever the key was on from a modification before you owned it.

      They only prime and continue running while cranking or running.


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      • ANDRÜ
        E30 Enthusiast
        • Aug 2006
        • 1020

        #4
        Thanks. I took it out of the car and gave it power, but it would only click still, must be seized from sitting for 7 years.

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