748 Rust In Fuel From Tank - Options ?

Discussion in '748 / 916 / 996 / 998' started by Fastmonkey, Sep 9, 2024.

  1. The 2nd of many posts I expect as I try and bring my recently acquired 748r back to life !

    When I went to view the bike the tank was empty and we splashed a bit of fresh super unleaded in there to fire it up so the fuel is a month old at very best and was in the tank for about 2 weeks.
    I took the tank off at the weekend as I needed to remove the fuel pump to get to the filters in there and check the hoses etc. this is what came out of the drain bolt hole. The tank from what I can see looks in pretty good condition so appreciate advice on what to do about the rusty flaky bits !

    fuel flush from tank.jpg
     
  2. Fill with vinegar for a day or two...rinse out...dry...and you are good to go. :upyeah:

    (If there are no leaks);)
     
  3. Thank you I had heard of vinegar - can you be more specific for me please, what type of vinegar, mixed with water, when you say fill - brim it ? (i've not done this before as you can tell ! )
     
  4. Just white cleaning vinegar will sort it (don't add any water). I imagine you won't need to brim it if the surface rust is only on the bottom surfaces... or rotate so vinegar covers the rusty looking parts...:upyeah:
     
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  5. I don't have any connection, but have used a form of the solution in the link below in the past, with success.
    https://www.evapo-rust.com/
    It's available from the following, and probably other suppliers:
    https://www.toolstation.com/evapo-rust-rust-remover/p55677
    It claims to be "Water-based formula is non-toxic, leaving no fumes or bad odours."
    It's not particularly cheap but in my experience it does the job and can be reused.
    This organisation sells alternatives I believe:
    https://www.frost.co.uk/fuel-tank-repair/
    and,
    https://www.frost.co.uk/rust-corrosion-treatments/
    although I haven't used them.
    Neither have I used vinegar, but if others have used it successfully, and its cost effective, it may be worth a try.
    Good luck, and I hope you solve the problem.
    Tom.
     
    #6 RTD, Sep 10, 2024
    Last edited: Sep 10, 2024
  6. i used this on my 749 track bike tank
    https://www.amazon.co.uk/gp/product/B019U5T9K2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
    worked well but my rust was fairly superficial and i didnt need to do it but i did just to preserve fuel filter life etc
    the solution once in the tank does need to be kept warm so think about how to do that ie element or similar

    if youve already removed the filter assembly then you know that the state of the tank is like inside

    it does work really well
     
  7. Oh you do need to brim it. If you don't the acid vapour from the vinegar will make the exposed metal go rusty. You can dilute it a bit with water, it still works. Afterwards neutralise with baking soda and water or the bare metal will flash rust. Leave somewhere well ventilated and away from stuff that can go rusty. Again the vinegar vapour will get to it. Things like lathe beds, pillar drill columns etc get tarnished by it.
     
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