Is it safe to say my fuel pump is dead?

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  • Killacortes
    E30 Mastermind
    • May 2010
    • 1937

    #1

    Is it safe to say my fuel pump is dead?

    86 325es 170k has two pumps one internal, one external. Went to start one morning ran fine. Turned off and went to turn back on and nothing. I put my Hand on the external pump underneath the car while gf cranks it and it's not pumping. I jump the fuel pump relay at pin 30 and 87 while cranking and still no fuel. I feel like the fuel line before the external pump is trying to get through but can't.
    So is it safe to say I need a new external pump? Does the main relay have anything to do with the pump turning on?
    Originally posted by blunttech
    r3v does not fuck around. First you get banned, then they shoot you
  • jlevie
    R3V OG
    • Nov 2006
    • 13530

    #2
    While the high pressure pump may have failed, you need to see if power reaches the pump when the relay is jumpered.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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    • Killacortes
      E30 Mastermind
      • May 2010
      • 1937

      #3
      There should be power to the pump with just key on ignition off right?
      Originally posted by blunttech
      r3v does not fuck around. First you get banned, then they shoot you

      Comment

      • nando
        Moderator
        • Nov 2003
        • 34827

        #4
        Originally posted by Killacortes
        There should be power to the pump with just key on ignition off right?
        no, not unless you jumper the relay.
        Build thread

        Bimmerlabs

        Comment

        • Killacortes
          E30 Mastermind
          • May 2010
          • 1937

          #5
          Awesome! Thanks guys I'll give it a shot today
          Originally posted by blunttech
          r3v does not fuck around. First you get banned, then they shoot you

          Comment

          • jlevie
            R3V OG
            • Nov 2006
            • 13530

            #6
            nando is correct. The fuel pump relay is controlled by the DME and only energized when the DME sees timing data from a rotating engine. Seeing power at the pump when you jumper the relay will tell in the wiring and fuse is good. The next test is to see if there is power at the pump with the relay in place while cranking.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

            Comment

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