Fuel Line & Petcock Hoses

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  • Gumbo76
    #1

    Fuel Line & Petcock Hoses

    I have a quick Question. Does anyone know if I am supposed to have a hose connecting to the nipple on the backside of the Petcock? There are two places to connect hoses to it. The bottom one is for the Fuel Line, but I can't figure out if I am supposed to have a hose connected to the other one. I see nothing on Bikebandit's schematics for a hose that goes there. I can't even find one in a manual. Any Clues? I would appreciate the help. Thanks!

    I'm trying to attach a pic so that you can see what I am referring to. It is to the Right of the Number 8. Thanks.
    Tags: None
    • gearhead13
      #2
      There are two nipples on a stock petcock, the bigger one is fuel to carbs, the second (smaller) one gets connected to the #2 carb for vacuum. The vacuum opens the petcock when the engine supplies vacuum while running. Your pic is pretty small, cant make out the numbers.

        Comment

        • tas850g
          Forum Sage
          • Jun 2008
          • 1678
          • Jaffrey, NH
          #3
          on my '79 850 the small nipple connects to the #3 carb for vacuum. That's with the VM carbs which was last used in '79. As you may know the '80 and newer switched to CV carbs and i know little to nothing about those.
          1979 GS850G
          2004 SV650N track bike
          2005 TT-R125 pit bike
          LRRS #246 / Northeast Cycles / Woodcraft / Armour Bodies / Hindle Exhaust / Central Mass Powersport

          http://s327.photobucket.com/albums/k443/tas850g/

            Comment

            • BassCliff
              #4
              Hi Mr. Gumbo76,

              Check out this page on my website:

              Where Do These Hoses Go?

              I'm sure you'll get it figured out. Yes, the VM carbs (~79 and earlier) have the vacuum connected to the #3 carb. The CV carbs (~80 and later) have the vacuum connected to the #2 carb.


              Thank you for your indulgence,

              BassCliff

                Comment

                • Big T
                  Forum LongTimer
                  Past Site Supporter
                  Super Site Supporter
                  • Mar 2005
                  • 12392
                  • West Slope, OR
                  #5
                  #3 carb is the vacuum attachment for sure on VMs

                  What is attached to the nipple on the inside of your #3 carb?
                  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

                    Comment

                    • Gumbo76
                      #6
                      Originally posted by Big T
                      #3 carb is the vacuum attachment for sure on VMs

                      What is attached to the nipple on the inside of your #3 carb?
                      I'm not sure what is attached to the INSIDE of the #3 carb, but I have Hoses coming off the bottom of Every Carb. So, If I get it wrong what will happen? Anything? Mine is Definitely a Pre-80 Engine, but how do I know if it is a CV or VM carb?

                        Comment

                        • Gumbo76
                          #7
                          Originally posted by BassCliff
                          Hi Mr. Gumbo76,

                          Check out this page on my website:

                          Where Do These Hoses Go?

                          I'm sure you'll get it figured out. Yes, the VM carbs (~79 and earlier) have the vacuum connected to the #3 carb. The CV carbs (~80 and later) have the vacuum connected to the #2 carb.


                          Thank you for your indulgence,

                          BassCliff
                          Bass, as always your knowledge and Insight has helped out tremendously! I found my manual on your website too. is that a recent addition? I don't remember seeing it there before today... although I haven;t looked at your site in a month or so. Anyway, thank you so much for your help. I certainly appreciate all the help!

                          -Gumbo

                            Comment

                            • Guest
                              #8
                              There is a nipple for a hose on the #3 carb. This is where the smaller petcock line is attached. It points up and is not at the bottom of the carbs. If you don't have a nipple on that carb the carbs are not stock and you need a mechanical petcock.

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