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Thread: Rubber Sleeves in K75/K100 Fuel Tank?

  1. #1
    Airheads & Bricks
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    Rubber Sleeves in K75/K100 Fuel Tank?

    What’s the purpose of these rubber sleeves on either side of the fuel pump mounting bracket and can they be removed without operational consequence? Mine are starting to come apart.
    629720F2-0EE9-45B6-AFE5-16FCE4A74001.jpeg

  2. #2
    Liaison 20774's Avatar
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    Shock/vibration mounts?
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  3. #3
    3 Red Bricks
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    Motiv8ed,

    Yes they are vibration bumpers.

    When the tank was built, the fuel pump shelf was welded to the floor section of the tank, then the floor was welded to the tank upper. Once the tank was welded together, there was no way to weld the outer edge of the pump shelf to the inside of the tank. This would cause the vibration of the pump to be transfered through the pump shelf to the side of the tank. This would have increased noise and cause potential wear to the side of the tank. The bumpers slide in from the top and wedge in there.

    If you try to replace them with something else, remember, they must be gasoline and ethanol proof.




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    Lee Fulton Forum Moderator
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  4. #4
    Airheads & Bricks
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    Vibration Bumpers

    [QUOTE=98lee;1268931]Motiv8ed,

    Thank you! I’d certainly replace them if they could be found…..no luck thus far. Any thoughts on where to find???



    Yes they are vibration bumpers.

    When the tank was built, the fuel pump shelf was welded to the floor section of the tank, then the floor was welded to the tank upper. Once the tank was welded together, there was no way to weld the outer edge of the pump shelf to the inside of the tank. This would cause the vibration of the pump to be transfered through the pump shelf to the side of the tank. This would have increased noise and cause potential wear to the side of the tank. The bumpers slide in from the top and wedge in there.

    if you try to replace them with something else, remember, they must be gasoline and ethanol proof.

  5. #5
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Welcome to the forum!
    If they are no longer available, I think you can size fuel injector hose, slice it down on one size and slide it in. Fuel injector hose is a grade up over regular gas line.
    Good luck.
    OM
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  6. #6
    3 Red Bricks
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    Regular fuel injection hose will not work. It MUST be rated “Submersible”.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
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  7. #7
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Looks like submersible is readily available-

    https://www.napabeltshose.com/~/medi...hose.pdf?la=en

    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    2009 F800GS 1994 TW200

  8. #8
    Airheads & Bricks
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    Submersable Hose

    Gotta love it! Got a NAPA just down the street. Thank you fellow Brick-heads!

  9. #9
    I just looked at the MaxBMW on-line parts fiche for the K75S fuel pump vibration damper. It appears to be an item that one can order.
    https://shop.maxbmw.com/fiche/Diagra...5&rnd=09082020

    From the image below the vibration damper is item #3

    k75s-fuel-tank.jpgk75s-vib-dampr.jpg

    There are somewhat less expensive alternatives. Amongst those are BeemerBoneYard; a fuel pump tune-up kit is available.
    https://www.beemerboneyard.com/16121464628nkl.html

    beemerboneyard-fuel-pump-tune-up-kit.jpg

  10. #10
    3 Red Bricks
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    Rob,

    The vibration dampers that he is looking for are for the pump SHELF, not the one that goes around the pump. The ones for the shelf are not listed in the parts fiche.





    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  11. #11
    I must be really confused. I recall you showing me the rubber damper for the fuel pump. I took heed of your caution about not allowing the rubber to degrade lest the expensive fuel pump suffer failure. Thus, I have replaced these fuel pump dampers a couple of times on my K75S bikes. I can't recall a "shelf" damper.

    My experience is limited to my red 88 K75S and blue 92 K75S (the one you helped me with).

  12. #12
    Ah Hah! Now I see what I did not previously. I agree that submersible fuel line would likely be a suitable replacement. Now I need to get some and replace these in my K75S bikes as they are likely way past due. Maybe Lee told me this and I forgot.

    fuel pump shelf dampers.jpg

  13. #13
    3 Red Bricks
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    The ones on the shelf are more of a plastic or very hard rubber and “almost” never need replacement. However, motiv8ed said his are coming apart. They are not available from BMW or any source that I am aware of. Submersible fuel hose might be a reasonable substitue.


    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

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