Vent hole(s) in filler neck of fuel tank??

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  • seano
    • Jan 2026
    #1

    Vent hole(s) in filler neck of fuel tank??

    I'm about to POR-15 the fuel tank on my 1980 GS850-g and a couple of different folks have warned me to make sure that I locate the vent hole in the filler neck of the tank so that i can poke a hole through it befor the sealer hardens. Trouble is there does not appear to be any hole there. There was a bit of paint overspray in that area from a prior repaint, so i sanded it down to bare metal and I still see no such hole. Is it possible that there isn't one for my year/model? Any ideas?
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    • raistian77
      #2
      vent is in the cap

        Comment

        • Guest
          #3
          Originally posted by seano
          I'm about to POR-15 the fuel tank on my 1980 GS850-g and a couple of different folks have warned me to make sure that I locate the vent hole in the filler neck of the tank so that i can poke a hole through it befor the sealer hardens. Trouble is there does not appear to be any hole there. There was a bit of paint overspray in that area from a prior repaint, so i sanded it down to bare metal and I still see no such hole. Is it possible that there isn't one for my year/model? Any ideas?
          Anything is possible, but i haven't seen a tank yet that doesn't have that little hole in the fill tube...

          Look closely right below the "lip" & see if it's there - it's a hole about the diameter of a paper clip wire...

            Comment

            • raistian77
              #4
              Originally posted by hikermikem
              Anything is possible, but i haven't seen a tank yet that doesn't have that little hole in the fill tube...

              Look closely right below the "lip" & see if it's there - it's a hole about the diameter of a paper clip wire...
              must be diffrent than the '79s mine vents through the gas cap

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                • tkent02
                  Forum LongTimer
                  Past Site Supporter
                  • Jan 2006
                  • 35571
                  • Near South Park
                  #5
                  The vent is in the cap, but the side hole needs to be open too. Otherwise air expands and pushes fuel out the vent all over the tank, also to let air out of the top of the tank so you can fill it all the way up. I make the hole a lot bigger, so I can put fuel in faster when I want it topped off all the way up.
                  http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                  Life is too short to ride an L.

                    Comment

                    • raistian77
                      #6
                      Originally posted by tkent02
                      The vent is in the cap, but the side hole needs to be open too. Otherwise air expands and pushes fuel out the vent all over the tank, also to let air out of the top of the tank so you can fill it all the way up. I make the hole a lot bigger, so I can put fuel in faster when I want it topped off all the way up.
                      Kent, could you take picture of this? It could explain why I cant fill the tank all the way up, fuel gets pushed out. I may need to check make sure mine is clear

                        Comment

                        • Nessism
                          Forum LongTimer
                          GSResource Superstar
                          Past Site Supporter
                          Super Site Supporter
                          • Mar 2006
                          • 35787
                          • Torrance, CA
                          #7
                          Originally posted by raistian77
                          Kent, could you take picture of this? It could explain why I cant fill the tank all the way up, fuel gets pushed out. I may need to check make sure mine is clear
                          Suzuki designed the tank with a baffle in the filler neck so there will be a little air at the top for expansion. Without that air space the fuel can expand and flow out of the top of the tank. Most GS tanks have that small hole but not sure if all models do.
                          Ed

                          To measure is to know.

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                            • tkent02
                              Forum LongTimer
                              Past Site Supporter
                              • Jan 2006
                              • 35571
                              • Near South Park
                              #8
                              Originally posted by raistian77
                              Kent, could you take picture of this?
                              http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                              Life is too short to ride an L.

                                Comment

                                • seano
                                  #9
                                  I found it! Thanks so much for the photo Kent. I still had a bit of paint beneath those notched out areas so I took an awl and probed around and there it was! Thanks again everyone - this forum ROCKS!!

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