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Thread: XB9S – running very roughly – tried various fixes – need some expert help!

  1. #21
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    Thanks for your further thoughts. I do have ECMDroid and find it very useful.
    I like the idea of Cooters - put a valve in the fuel block - then in future very easy to test.
    I will also make up a fuel pressure test kit as a useful thing and when I have it anyone else in the UK is welcome to pop around to me and use it - I am in West Sussex - near Goodwood race track.
    The bike has no way of measuring fuel pressure - other than the consequences of too much/little via only the O2 sensor. So if I have the connector for hooking into the fuel supply hose at intake end - I could just feed fuel to it at 50psi from another source and it bike runs fine then another way to test/prove if the Buells own supply (pump/filter etc) is duff or not?
    Back to the workshop to keep on with the testing...

  2. #22
    Senior Member lunaticfringe's Avatar
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    I like the idea of Cooters - put a valve in the fuel block - then in future very easy to test.
    this is a joke.....correct?

    FUEL PUMP!

    i'm seeing these units fail now at an alarming rate....2 per week on average. don't dick around piece-mealing a part here and there. utter waste of time.

    symptoms??????????
    1-excessive crank-to-start time.
    2-lazy/annoying/border-line dangerous throttle response.
    3-refuses to start at all.
    4-pump primes but won't start.
    5-stratospherically and suddenly high AFV value......THE clue. why??? i'll leave that up to the self-absorbed ecm/data-logging/techno jibberish fags...but i'm GUESSING extended pulse-width to the injectors due to low pressure AND quantity causing a 147 AFV value. hmmmmmmmmmmm???????????

    your bike is 16 years old and if it is an early production model the pump is 17 years old. SERVICE IT!

    SEE SCHEMATIC:
    #10----replace. you'll have to hand-build fore and aft bushings out of simple fuel line. have explained how to do that.
    #13----replace.
    #29----replace.
    #20----replace.
    RED ARROW---probably ok but comes with kit. replace!

    see ebay link. i keep kits in stock.....i keep #13 in stock.....i keep #10 cross-overs in stock.
    https://www.amazon.com/HFP-361BU-200.../dp/B00S25Q82Y

    pump.jpg
    Last edited by lunaticfringe; 03-02-2019 at 11:36 AM.

  3. #23
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    So John, correct me if I'm wrong, if it needs to be rebuilt or serviced as in the schematic, I would think that it would show a problem with the fuel pressure, yes ? If this is true, why not check the fuel pressure first before removing it and replacing the parts ? The reason I ask is because, I asked about being proactive with the maintenance on the bike, in particular the fuel pump and I was told, if it ain't broke, don't fix it, so this is why I'm so curious about this..

    Thanks

  4. #24
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    Ok LunaticFringe - All that I have been testing does point to this - Your summary of symptoms are spot on and thanks for taking the time to help out a complete stranger with advice.
    Looked at the Amazon link you gave - is this you?
    as if so happy to get it and #13 and #10 - but cant see 13 and 10 to order?

  5. #25
    Senior Member lunaticfringe's Avatar
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    Looked at the Amazon link you gave - is this you?
    as if so happy to get it and #13 and #10 - but cant see 13 and 10 to order?


    i don't sell on amazon...only ebay and website. i keep both complete new pumps as well as complete rebuild kits...a/m filters....fuel line....OEM O-rings in stock. if and when you pull the pump and find that it needs rebuilt just PM me and i'll get you fixed up.
    Last edited by lunaticfringe; 03-18-2019 at 01:02 PM.

  6. #26
    Senior Member Silverrider's Avatar
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    John Will fix you up .
    64471910.jpg

  7. #27
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    O.k., sounds like very good advice, thanks for clearing it up.

  8. #28
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    Have ordered up all the bits in the UK as I really want to ride my bike! Except #10 (inline fuel filter) - anyone know a part # or UK source or Lunaticfringe - would you consider sending via a quickish service?

  9. #29
    Senior Member lunaticfringe's Avatar
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    Quote Originally Posted by CrashBurnFly View Post
    Have ordered up all the bits in the UK as I really want to ride my bike! Except #10 (inline fuel filter) - anyone know a part # or UK source or Lunaticfringe - would you consider sending via a quickish service?
    paul: the mesh sock filter goes on suction side of pump....the metal inline filter goes on outlet/pressure side. the metal filter crosses over to a 1985-87 ford mustang. here are a few cross-reference filters that are identical:
    WIX 33095
    NAPA 3095
    DURALAST FF3330DL

    i also HIGHLY RECOMMEND you replace the fuel level sensor while doing this job. if it isn't bad now it will be shortly.
    OEM PART # P0789.KA retails for $14. it is #4 in pic.
    lastly....look at pic....part #12. it is the ground screw. it's the main connection between the ecm and the pump. clean and tighten the hell out of it.

    64471910.jpg

  10. #30
    Senior Member jl551c's Avatar
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    Check all your wires carefully for any rubbing. Here's a pic of mine that rubbed on through and caused false lo fuel level indications.

    IMG_1649.jpg



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