GS1000E Fuel and associated hose routing

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  • RIGGER
    • Feb 2026

    #1

    GS1000E Fuel and associated hose routing

    I have a 1978 GS1000E and need to find an accurate drawing/photo/illustration of where the hoses go to and from the fuel tank to the carbs.
    I know one is fuel delivery, one is vacuum and there are at least four drains from the float bowls but I need an accurate representation does anyone have such a thing they could assist with...Jim
  • tkent02
    Forum LongTimer
    Past Site Supporter
    • Jan 2006
    • 35571
    • Near South Park

    #2
    Fuel line is the fat one from from the petcock to the fuel T, The vacuum line from #3 carburetor goes to the smaller port on the petcock. The float bowl overflows (one off the bottom of each float bowl) go down betwen the engine and the swing arm, they just dangle there. The float bowl vents, two hoses up high on #2 and #4, tht look just like the vacuum line on #3, go up and over the top of the air box, don't connect to anything. There is a little slot to hold them in place.
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

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    • Guest

      #3
      There is a square opening behind the transmission on the right side that the bowl overflows dangle through.

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      • ShadowFocus603

        #4

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        • Big T
          Forum LongTimer
          Past Site Supporter
          Super Site Supporter
          • Mar 2005
          • 12392
          • West Slope, OR

          #5
          Originally posted by ShadowFocus603
          wrong carbs
          1978 GS 1000 (since new)
          1979 GS 1000 (The Fridge, superbike replica project)
          1978 GS 1000 (parts)
          1981 GS 850 (anyone want a project?)
          1981 GPZ 550 (backroad screamer)
          1970 450 Mk IIID (THUMP!)
          2007 DRz 400S
          1999 ATK 490ES
          1994 DR 350SES

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          • RIGGER

            #6
            Thanks tkent02 that is a great help.....Jim

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            • 1980GS1000E
              Forum Sage
              Past Site Supporter
              • Aug 2007
              • 1665
              • San Diego, California, USA

              #7
              A word here-

              The float bowl vent tubes need to end at a location above the carbs. Stock is about the height of the airbox top at the rear end of the fuel tank pointed rearward out of the airstream. If the carb vent hoses end below the carbs, fuel can be siphoned out of them resulting in poor running and horrible mileage.
              Current Rides: 1980 Suzuki GS1000ET, 2006 H-D Fatboy, 2021 BMW K1600B

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              • RIGGER

                #8
                Thanks for the tip about fuel float bowl height

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