Fuel Leaking problems

Discussion in 'Old's Cool' started by Roadwarrior, Oct 11, 2005.

  1. Roadwarrior

    Roadwarrior Taking The Long Way

    Joined:
    Apr 6, 2002
    Oddometer:
    1,004
    Location:
    Great White North
    I've got fuel leaking from My 1978 GS550. The fuel seems to be comming from the overflow hose running to the airbox. At first I suspected a stuck float, but when I left a can under the bike over the weekend I was left with quite a bit of fuel that had spilled, and it seemed to still be dripping. Shouldn't the petcock have cut off the flow of fuel so that only what was in the bowls could leak out? Why is gas getting in the airbox and then leaking out? It seems to be running way too well to have a stuck float.

    Any opinions out there?
    #1
  2. Solo Lobo

    Solo Lobo airhead or nothing

    Joined:
    Mar 16, 2004
    Oddometer:
    9,169
    Location:
    Shoreline, WA
    vaccum petcock?


    If no (or even yes) I'd bet the rubber insert in the petcock is worn out and fuel is bypassing that to the carbs.
    #2
  3. Rustic

    Rustic Pass the gas.

    Joined:
    Oct 1, 2005
    Oddometer:
    114
    Location:
    Asheville, NC
    +1

    The rubber diaphragm in the petcock probably has a hole or tear in it. I'd recommend either replacing the petcock or rebuilding it.
    #3
  4. Roadwarrior

    Roadwarrior Taking The Long Way

    Joined:
    Apr 6, 2002
    Oddometer:
    1,004
    Location:
    Great White North
    Looks like it may be the diaphram after all. I could not get a rebuild kit for it, and the dealer showed the petcock as discontinued. I ordered a new one from Bikebandit.
    #4