Unexplained fuel fire on 2002 1150GS Adventure - clipped from MikeO's ride report

Discussion in 'GS Boxers' started by MikeO, Dec 5, 2012.

  1. Poolside

    Poolside Syndicated

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    Mike's 'on fire' pic shows both the 'return line' fuel connector and injector connector unplugged. He thinks they may have got that way via a prankster pressing the release levers on both those parts, but leaving them look like they are still connected. That assessment seems about the most reasonable since the connectors cannot disconnect themselves.

    After a bit of riding the 'pranked' fuel line connector and fuel injector connector will separate. You've seen how easy fuel can spray from the male side of the fuel connector. That leaves the fuel injector connector.

    Disconnecting the fuel injector while under power makes a healthy spark. (And gives you a 100V+ shock if powering the injectors on the test bench via alligator clips!) PLenty enough spark to ignite gasoline.

    With one fuel injector disconnected, and one cylinder not getting any fuel, the catalyst runs very cool. One cylinder is simply a cool air pump, and plain air doesn't catalyze.


    <BR>
    #21
  2. vintagerider

    vintagerider Long timer

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    Jim, Others may be confused. You agree that a completely disconnected plug won't produce ignition? If inj connector is completely unplugged then where did the spark come from? Do you not believe hot exhaust is a possible ignition source?

    As far as tampering, I have managed to leave both the QD and the Inj plug not totally connected. Only ran with the QD connected but not fully locked

    Lets get back to prevention:
    1. always shut down, don't idle. A fuel leak in motion is not nearly as dangerous as one at idle
    2. replace rubber hoses every (3-4?) yrs when they harden crack
    3. inspect black nylon fuel distributor (daily?) replace it every (_? months) or whenever it shows signs of (_?)
    4. install automatic foam deployment system
    5. can you live w/o QD's

    Or, Non of the above, just wear fire resistant clothing?
    #22
  3. AntonLargiader

    AntonLargiader Long timer

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    1. When your bike is running so crappy that it will only run at WOT, consider PAYING ATTENTION TO THE BIKE rather than leaving it locked at the aforementioned WOT while you go do something else.
    #23
  4. Mr Head

    Mr Head PowerPoint ADV

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    2004 1150 Adventure US model, ABS

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    #24
  5. Pekkavee

    Pekkavee Been here awhile

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    Good advice. I will remember it
    Thanks.

    Pekka:eek1:eek1:eek1
    #25
  6. pcwirepro

    pcwirepro Aspiring Adventurer

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    Seems it's missing in the second photo.

    #26
  7. Mr Head

    Mr Head PowerPoint ADV

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    The PIA OEM plug went into the bin long ago. I replaced it with a /2/5/6/7 part I found one early morning heading to breakfast in Big Sur. That one got hard from the heat and I pitched it and replaced it with a brand new one I promptly lost about 50,000 miles ago.
    Doesn't seem to bother me much. It hasn't been a problem where I live, or where I've ridden. (Colorado, Utah, New Mexico, Arizona, California, Oregon, Washington). So, I saved myself a few cents. I don't look in there anyway. It's dark and scary. Could be spiders, in fact when I moved the bike to make the pictures I saw one scurrying away.:eek1
    Since All I get to do is walk around the bike every few weekends.:cry

    #27
  8. def

    def Ginger th wonder dog

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    Yes and so is the RH leading link pivot cover...shame.
    #28
  9. Tbone

    Tbone off-ramp slayer

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    F* that cover! I'm missing mine again too.
    #29
  10. Mr Head

    Mr Head PowerPoint ADV

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    Mine have popped off several times. I blame the fuel lines.
    [​IMG]
    #30
  11. O-livier

    O-livier S'en fout la mort!

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    These pics do break my heart... such a beautiful GS!

    My limited 2 cents to the debate : Defective QD may explain how the fuel leaked but not why the bike caught fire. Have had many fuel leaks on hot engines and the bike never caught fire... strong smell and immediate evaporation is the result from the leak... Need an open flame or a spark to actually ignite the fuel... What coud have caused an open flame or sparks right next to the leaking fuel? :ear
    #31
  12. X1Glider

    X1Glider Been here awhile

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    I only though the final drive could start a fire.:hide

    Seriously, that sucks. My 1100GS was one of my favorit bikes I've owned. Gotta say the replacement looks a peach, Has my favorite cases too.:thumb
    #32
  13. scooteraug02

    scooteraug02 Dog Rancher

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    One day on my 2003 GSA I started the machine, put my gloves on and gave it a look over before I hopped on. I noticed a good flow of fuel coming from the fuel hose by the pinch clamp shown in the picture below. There are two clamps one above the injector and the other just up the hose. I took a pair of wire cutters or dykes and pinched the clamps stopping the leak.

    [​IMG]

    In this picture similar clamps are under the red and yellow shrink rap or tape at the ends. Years ago there was a big QD thread. One expert who sold QDs said they weren't designed to have clamps on them.

    [​IMG]

    Here is the thread I am referring to Reliability of quick disconnects from McMasters Carr Expert was Poolside.
    Read the last paragraph of quote below.



    #33
  14. GS Addict

    GS Addict Pepperfool

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    I was up at my nephews ranch and did an experiment last fall.
    We hooked up an old range outside an put a pot of gasoline on it and left the element on high.
    Ambient temp. was about 60F.
    The whole pot of gas boiled away and then the aluminum pot eventually melted.
    No fire - I was surprised.
    #34
  15. Spaggy

    Spaggy Long timer

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    Good thing you guys didn't have any C4 or dynamite kicking around to play with.:lol3
    #35
  16. AntonLargiader

    AntonLargiader Long timer

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    A more appropriate test would have been pouring the gas onto the element, though. As it was, the gas probably never exceeded its boiling temperature, which isn't all that hot.
    #36
  17. DaFoole

    DaFoole Pacific Avenger...

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    GREAT job on the rebuild...:thumb


    :lol3


    Seriously....it made me sick when I read your RR and saw the fire.

    Glad to see your up and at it again. :D
    #37