R100GS Fuel Line Replacement

Discussion in 'Airheads' started by CaribouCases, Aug 30, 2008.

  1. CaribouCases

    CaribouCases Boulder CO

    Joined:
    May 25, 2004
    Oddometer:
    1,262
    Location:
    Adventure Rider & Aftermarket Systems Manufacturer
    I recently picked up a nice '94 R100GS, it needs a little love. My fuel lines are old and leaky (the ones on the bike smart guy). Is it possible to fish out the one that goes under the air box without having to take the air box out?

    I searched topic to no avail.
    #1
  2. phactory

    phactory Motorcycle Rescue

    Joined:
    Sep 6, 2005
    Oddometer:
    440
    Location:
    State of Mind
    If you are going to replace the fuel line with the 7mm cloth braided fuel line that BMW sells, you will have to at least loosen the airbox to slide the fuel line through the opening. There are 2 bolts that attch it to the top rail of the tranny and one that attaches it to the top of the tranny. Not that big of a deal really.

    PhacK



    #2
  3. dfc

    dfc Reluctant Cannonball

    Joined:
    Jun 28, 2006
    Oddometer:
    2,844
    Location:
    FunkyTown
    #3
  4. CaribouCases

    CaribouCases Boulder CO

    Joined:
    May 25, 2004
    Oddometer:
    1,262
    Location:
    Adventure Rider & Aftermarket Systems Manufacturer
    Thanks. I got the old one out and there was no way the new one was going back in without loosening up the airbox. Basically had to take the left carb partially off to get all the air/emissions parts out of the way to access those 3 bolts holding the box to the tranny. Would have been nice if there was a tube in there to slide the crossover fuel line in and out:wink: .
    #4
  5. jackd

    jackd Long timer

    Joined:
    Dec 9, 2006
    Oddometer:
    3,528
    Location:
    The Island
    I changed my fuel lines without loosening my airbox on my R100GS. I purchased my fuel line from MAX BMW (standard fuel line - not the fabric covered variety) and fed it into the cross-over space under the airbox. MAX coils the line when they ship it, so the line has a tendency to not travel straight and therefore snag on the gearbox structure. I just fed in a straight welding rod from the other side of the box and used the end of the welding rod to guide the hose end through the tight opening. Done in minutes - no bolts or carbs removed. Jackd
    #5
  6. datchew

    datchew Don't buy from Brad

    Joined:
    Aug 1, 2005
    Oddometer:
    7,409
    Location:
    Remember the Alamo!
    you CAN fish out and "twist" through the braided stuff without loosening a single bolt. It's a pain, but it can be done.

    Bing's special fuel line recently change. Not the same wonderful stuff they used to have.

    Spare yourself the money and pain and just go buy 1/4" ID black urethane fuel line from Dennis Kirk or the like. Cheap, better, easy.
    #6
  7. jtwind

    jtwind Wisconsin Airhead

    Joined:
    Nov 19, 2004
    Oddometer:
    3,473
    Location:
    Madison WI
    Sorry to hear that the bing line has changed, I liked the old stuff. Lots of folks I know of use a cloth covered line you can buy from VW parts suppliers. Like the BMW stuff but less expensive.

    You can get the cloth line through there without removing stuff. I usually put a thin wooden dowel through it and that helps/
    #7
  8. Hi Viz Guy

    Hi Viz Guy Be Seen and Be Safe

    Joined:
    Jan 22, 2008
    Oddometer:
    358
    Location:
    South Western PA
    What is the fuel line diameter for the R100 GS?
    Getting ready to order up some new fuel lines and filters...
    #8