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External fuel pump crapping out? *sound clip*

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    #1

    External fuel pump crapping out? *sound clip*

    So my external pump has been making death noises for some time now. I replaced the lift pump in the tank hoping that would clear it up but no such luck. I'm concerned that the pump may be faulty which is a simple fix (replace it) but I've also heard of these sucking up air somehow causing a lot of noise. So I took a short sound clip hoping some experts can chime in.

    I'd hate to replace it and have the same horrid noise because it was just a simple leak. With that said, I've already checked the in take hoses and added hose clamps to confirm they are sealing.

    The intermittent noise can be heard clearly at 6, 8, 11, 13 and 15 seconds.
    http://youtu.be/BbvNYBdg5gs
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    #2
    A noisy high pressure pump will be the result of; starvation of the pump, an obstructed output path, a worn pump. Since you have replaced the in-tank pump starvation shouldn't be an issue unless the tank has a layer of rust in it. A clogged filter or pinched line can cause the pump to be working harder than it is supposed to. That leaves a worn pump as the cause. If the tank has a layer of rust sediment in it, until the rust is dealt with a new pump will have a short life.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      Originally posted by jlevie View Post
      A noisy high pressure pump will be the result of; starvation of the pump, an obstructed output path, a worn pump. Since you have replaced the in-tank pump starvation shouldn't be an issue unless the tank has a layer of rust in it. A clogged filter or pinched line can cause the pump to be working harder than it is supposed to. That leaves a worn pump as the cause. If the tank has a layer of rust sediment in it, until the rust is dealt with a new pump will have a short life.
      What's a good way to clean a tank out attached to the car?
      Originally posted by 325Projectz
      don't listen to the diagram... listen to mr. swiss.
      :nice:

      Comment

        #4
        Originally posted by Mr.SWISS View Post
        What's a good way to clean a tank out attached to the car?
        There isn't one, due to the shape of the tank. The tank has to be out of the car to clean it. If it is rusty inside, but otherwise in good shape, acid cleaning and sealing is much cheaper than a new tank.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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          #5
          new tanks are pretty cheap - around $200 or less. If I went through all the effort of pulling the fuel tank, I wouldn't want to bother putting an old one back in.. $0.02
          Build thread

          Bimmerlabs

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            #6
            you can check for rust fairly easily by popping out the lift pump and taking a look inside. Being in AZ chances are you dont have an issue with rust in the tank. If your car has as many miles on it as I think it does (200k+) then the pump is likely just worn out. easy to change, and fairly cheap as well.
            I saved 15% on my Bimmer parts by switching to ...



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              #7
              I looked in the tank when i changed the lift pump and didn't see any rust or major contaminate.

              I've heard there is a microfilter in the nipple on the inlet of the main pump. Might be worth a shot to pull the line and see if it's clogged? But yes, the pump appears to be original and the mileage is way over 200k. Maybe I should just order a new one, consider it prevenative maintenance, if it still makes the noise trouble shoot from there...

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