No power at fuel pump

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  • jaydeep
    Wrencher
    • Jun 2011
    • 208

    #1

    No power at fuel pump

    I changed fuel pump and car did not turn on. I took volt meter and checked there is no power at the pump. There was power before I changed fuel pump. What could be wrong? I can see wire is going to the trunk. Do you guys have fuel pump wiring diagram? Anyone got solution?
    sigpicGLETSCHERBLAU METALLIC with leather INDIGO LEDER interior and blue top.
  • Sputnik
    E30 Modder
    • Jan 2010
    • 808

    #2
    Check the main-relay

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    • jaydeep
      Wrencher
      • Jun 2011
      • 208

      #3
      Originally posted by bukaki_bob
      Check the main-relay
      I don't have another one to swap. Is there a was to tell if relay is bad?
      sigpicGLETSCHERBLAU METALLIC with leather INDIGO LEDER interior and blue top.

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      • Rigmaster
        No R3VLimiter
        • Jul 2004
        • 3464

        #4
        there's not always power to the fuel pump unless the engine is turning over

        You can jump the terminals on the fuel pump relay to check and see if the wiring is OK- just connect the 2 larger wires out of the 4, I *think* one is red and the other is purple/green. Jumping them will send power to the fuel pump whether the key is on or off, so don't do it too long.


        Why did you change the fuel pump????

        Comment

        • jaydeep
          Wrencher
          • Jun 2011
          • 208

          #5
          Originally posted by Rigmaster
          there's not always power to the fuel pump unless the engine is turning over

          You can jump the terminals on the fuel pump relay to check and see if the wiring is OK- just connect the 2 larger wires out of the 4, I *think* one is red and the other is purple/green. Jumping them will send power to the fuel pump whether the key is on or off, so don't do it too long.


          Why did you change the fuel pump????
          Car is been sitting in garage for 4 years and won't start. So I put little gas in air intake and car wanted to start. Car was not getting gas so I looked if fuel pump is getting power. It was then I took out fuel pump and it was shot. Also had to change injector since they were clogged. After doing all that all the sudden no power at fuel pump.
          sigpicGLETSCHERBLAU METALLIC with leather INDIGO LEDER interior and blue top.

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