carb 1 then 2

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  • MR.G
    #1

    carb 1 then 2

    hey folks, I have a 78 gs750C. Carb one has started to overflow while running then slowly carb 2 starts to over flow. Have taken the carbs off but not yet cleaned them. Could this be the gas tank petcock as well. Thanks
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    • Steve
      GS Whisperer
      • Jun 2005
      • 35925
      • southwest oHIo
      #2
      Usually, when you have a leak like that, it's because you have TWO failures.

      1. The petcock is not stopping fuel flow.

      2. The floats in the carb are not holding back the fuel.

      If only one of those fails, you will never know. It's not until BOTH of them fail that you notice.

      .
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        • MR.G
          #3
          thanks Steve

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            • tkent02
              Forum LongTimer
              Past Site Supporter
              • Jan 2006
              • 35571
              • Near South Park
              #4
              If it's overflowing only while it's running it's not the petcock's fault. It's supposed to be open when it's running.
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                • earlfor
                  Forum LongTimer
                  Charter Member
                  GSResource Superstar
                  Past Site Supporter
                  • May 2002
                  • 42413
                  • off grid cabin 1/24/26 7pm
                  #5
                  Originally posted by tkent02
                  If it's overflowing only while it's running it's not the petcock's fault. It's supposed to be open when it's running.
                  Beat me to it. I was thinking the same thing. If it overflows with the engine NOT running, the problem is definitely the petcock and the float valves.
                  With engine running, it is float valves or float height.
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                  I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

                    Comment

                    • btbarb
                      #6
                      debri

                      What everyone else said so far and -

                      If debri interferes with the float valve it will never seat and fuel will keep flowing (if it's running).

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